Mechanical Engineering

Head of Department

Dr. Koushik Das
Ph.D (IIT Guwahati)

E-mail:
hod.me@nitm.ac.in

Faculty

Back

Dr. Rajat Subhra Das Assistant Professor

Ph.D, IIT Delhi

rajatsubhra@nitm.ac.in
9402102380
http://https//nitmeghalaya.irins.org/profile/101615

Research Interest

Solar Thermal Heating/Cooling, Refrigeration and Air-Conditioning Systems, Renewable Energy, Heat and Mass Exchangers

Education Qualification

Ph.D, IIT Delhi

Links

Work Experience

  • Assistant Professor, ME Department, NIT Agartala, Agartala, Tripura, India
    (July, 2014-June, 2015)
  • Assistant Professor, ME Department, NIT Meghalaya, Shillong, Meghalaya, India
    (July, 2015-Present)

Courses Taught

At UG(B.Tech) Level: Core Courses
Applied Thermodynamics ME206 (3-0-0:3)

Fluid Machines ME 220 (3-0-0:3)   

Engineering

Thermodynamics ME102 (2-0-0: 2)

Heat and Mass Transfer, ME 301 (3-1-0:4) Autumn Semester, 2015

 

At UG(B.Tech) Level: Elective Courses

Refrigeration and Air-Conditioning ME 435 (3-0-0:3)

Power plant Engg. And Energy Audit. ME 371 (2-0-0:2)


At PG Level: 

Experimental Methods in Mechanical Systems ME 553 (3-0-0:3)

Seminar-I ME 550 (0-0-2:1) 

At Doctoral Level:

Measurement Systems in Mechanical Engineering ME 701 (3-0-0:3)


Projects

Sponsored Research Projects

 

Sl no.

Title of Project

Role

Co-Investigator (If any)

Funding Agency

Sanctioned Amount (INR)

Duration

1.       

Development of a Novel Solar Driven Dedicated Outdoor Air System (DOAS) for Space Heating and Liquid Desiccant Dehumidification with Direct/Indirect Contact Heat/Mass Exchangers for Meghalaya Region

PI

NIL

Science and Engineering Research Board (SERB), DST

32,41,700/-

10/03/2021-

09/03/2024

 

2.       

Development and Testing of Solar Photovoltaic (PV) assisted Hybrid Double-Slope Desalination Solar Still for Off-grid Rural-North East India

Co-PI

Dr. Biplab Kumar Debnath

Science and Engineering Research Board (SERB), DST

29,00,909/-

12/01/2021- 11/01/2025

3.       

Development of a Novel Falling Film based Liquid Desiccant Dehumidification System

 PI

NIL

 TEQIP-III

 1,99,900/-

04/03/2021-31/03/2022

4.       

Solar based Room Heater

cum Food Drier with

Energy Storage Unit

 PI

NIL

State Council

of Science

Technology &

Environment

(SCSTE),

Meghalaya

  97,834/-

18/10/2019-17/10/2021

 

5.       

Standalone Solar Tea/

Coffee Maker cum

Multipurpose Water Heating System

PI

Dr. Sanjoy

Debbarma, Dr.

Kishore

Debnath, Mr.

Sushanta Nath

 

DIC, MHRD

8,57,200/-

14/06/2017-13/07/2019

 

Consultancy Projects

 

Title of Project

Client

Role

 

Co-Investigator (If any)

Budgeted Amount (in INR)

Duration

Nature (Design/ Vetting/ Testing etc.)

Vetting of DPR for the project setting up of Tribal Research Institute at Chidegre (Babadam), West Garo Hills District

PWD (Buildings), Meghalaya, Shillong

PI

Dr. C. Marthong, Dr.

M.L. Patton, Dr. HM Kalita, Dr. D.K. Sharma, Dr. S. Debbarma, Dr. P.K. Rathod

31,46,000/-

1 year

Vetting

PhD Students Guided

Sl no

Name of the scholar (Roll no.)

Title of Thesis

Date of ODE

Year of Degree award

Role

 

Co-Supervisor (if any)

1

Mr. Aabir Das (P16ME004)

 

Performance Enhancement of a Falling Film based Liquid Desiccant Dehumidifier with Surface Modifications

31/10/2022

2022

Principal Supervisor

Dr. Koushik Das

2

Mr. Parag Jyoti Bezbaruah (P16ME001)

Studies of the Thermohydraulic Performance of Solar Air Heater with Novel Vortex Generators

07/12/2021

2021

Principal Supervisor

Dr. Bikash Kumar Sarkar

3

Subhasish Das (P15ME003)

Investigation into the Combustion Behaviour of a Single-Cylinder Diesel Engine with Porous Media in Piston Bowl

07/09/2021

2021

Co-Supervisor

Dr. Biplab Kumar Debnath

PG DISSERTATION GUIDED

SL NO.

STUDENT'S NAME

DISSERTATION / PROJECT TITLE

CO-SUPERVISOR [IF ANY]

YEAR OF AWARD

1.      1

Noel M. Rajive

TRNSYS simulation study of solar thermal systems

NIL

2022

Hussain Peera

Studies on the performance of a solar air heater with triangular pyramid vortex generator

NIL

2021

Swranghsa Basumatary

Overall performance improvement and development of correlations for a triangular duct solar air heater subjected to THC-VGS

NIL

2020

Dinesh Kumar Yadav

Estimation of thermal performance of triangular finned multitube LHTES

NIL

2020

Anuj Kumar

CFD analysis of solar air heater using curved absorber plate with semi-circular ribs

NIL

2020

Ankush Bhandarkar

Room temperature control through solar air heater

Dr. Bikash Kumar Sarkar

2020

Rahul Kumar

Thermohydraulic performance analysis of a solar air heater with helical roughness

NIL

2019

Aadil Kureshee

Thermohydraulic performance analysis of shell and tube heat exchanger

NIL

2019

Abhishek Kumar Gupta

Enhancement of heat transfer in solar air heater using vortex generator

Dr. Bikash Kumar Sarkar

2018

Hirakjyoti Barman

Simultaneous heat and mass transfer analysis in falling film absorber

NIL

2018

Angad Kumar Singh Kushwaha

Study on the performance characteristics of direct contact liquid desiccant dehumidifier

NIL

2017

UG DISSERTATION GUIDED

SL NO.

STUDENT'S NAME

DISSERTATION / PROJECT TITLE

CO-SUPERVISOR [IF ANY]

YEAR OF AWARD


Anubhav Dixit,

Ayushi Vats,

Helmostar Marbaniang

Development of an intelligent charging management system for electric vehicles using blockchain

Dr. Bunil Kumar Balabantaray

2023

Leonard Sun, Kynjrilang Syrti, Mangbunshongdor Lyngdoh,

Abandenovo Ladia

Computational analysis of a solar air heater with a uniquely designed absorber plate

Dr. Bikash Kumar Sarkar; 

Dr. Sambit Majumder

2022

Chetyanand Nigotia, Rajendra Meena, Saurabh Singh,

Prithul Datta

Transient analysis of solar collection systems with TRNSYS 

Dr. Bikash Kumar Sarkar

 2021

Ankit Kumar R Sharma,

Pynsuklang Hayong

Design and development of aluminum/graphene composite based thermal heat sink

Dr. Kishore Debnath

 2020

Mandeep,

Sonu Gupta,

Kundan Kumar, 

PV/T integrated solar still towards a sustainable solution to meet fresh water scarcity in India

NIL

2019

Srinivas Lavudi,

Vivek Kumar Mall, Guda Naveen Reddy 

Investigations on the performance of a single basin solar still with sensible heat storage

NIL

2018

Amarjeet Kumar Ram, Redsing Marbaniang, Manjay Kumar

Application of a CFD Model to Predict the performance of a basin solar still

Dr. Biplab Kumar Debnath

2017

Abu Hanifa Mohammed, Lianlamlun Naulak, Gloria Sangma

Feasibility Study of the Application of Absorption System in a Car

NIL

2017

Summer Internship:

Abdullah Ansari, Solar-Assisted Liquid Desiccant, 2023.

Vishal Kumar Bhaskar, Solar Air Heating Systems. 2023

Publications

International Journals

 

  1. Das A., Das R.S., Das K., Numerical analysis of liquid desiccant dehumidification system with novel trapezoidal baffled surface, International Journal of Refrigeration 145, 457-466, 2023.

 

  1. Das A., Das R.S., Das K., Performance analysis of aqueous LiCl and CaCl2 based falling film dehumidifier with surface modification, Applied Thermal Engineering, 200, 117704, 2022.

 

  1. Das A., Das R.S., Das K., Performance enhancement of a liquid desiccant absorber with triangular corrugated structured packing, Journal of Building Engineering, 45, 103677, 2022.

 

  1. Das S., Debnath B.K., Das R.S., Analyzing the Combustion Behavior of different Ceramic Porous Media in the Piston Bowl of a Diesel Engine, Journal of The Institution of Engineers (India): Series C, 1-15, 2022.

 

  1. Bezbaruah P.J., Das R.S., Sarkar B.K., Experimental and numerical analysis of solar air heater accoutered with modified conical vortex generators in a staggered fashion, Renewable Energy,  180, 109-131, 2021.

 

  1. Bezbaruah P.J., Das R.S., Sarkar B.K., Experimentally validated 3D simulation and performance optimization of a solar air duct with modified conical vortex generators, Solar Energy, 224, 1040-1062, 2021.

 

  1. Das S., Debnath B.K., Das R.S., Experimental investigation of porous media combustion applied on the piston bowl of diesel engine, Journal of the Brazilian Society of Mechanical Sciences and Engineering, 43(3), 1-14, 2021.

 

  1. Bezbaruah PJ, Das RS, Sarkar BK. Overall performance analysis and GRA optimization of solar air heater with truncated half conical vortex generators, Solar Energy, 2020, 196, 637-652.

 

  1. Bezbaruah P.J., Das R.S., Sarkar B.K., Solar Air Heater with Finned Absorber Plate and Helical Flow Path: A CFD Analysis, Applied Solar Energy, 56, 35-41, 2020.
  2. S Das, BK Debnath, RS Das, A Stagni, T Faravelli, Numerical investigation of a porous media combustor in a small-scale diesel engine, Energy 186, 115785, 2019.

 

  1. Bezbaruah PJ, Das RS, Sarkar BK. Thermal and Fluid Flow Analysis of Miller Teeth Shaped Ribbed Solar Air Heater-A CFD Approach, Journal of Scientific & Industrial Research, 2019, 78, 694-698.

 

  1. Bezbaruah PJ, Das RS, Sarkar BK. Thermo-hydraulic performance augmentation of solar air duct using modified forms of conical vortex generators, Heat and Mass Transfer, 2019, 55, 1387-1403.

 

  1. Das RS, Jain S. Performance characteristics of cross-flow membrane contactors for liquid desiccant systems Experimental investigations on a solar assisted liquid desiccant cooling system with indirect contact dehumidifier, Solar Energy, 2017, 153, 289-300.

 

  1. Das RS, Jain S. Performance characteristics of cross-flow membrane contactors for liquid desiccant systems, Applied Energy, 2015, 141, 1-11.

 

  1. Das RS, Jain S. Simulation of potential standalone liquid desiccant cooling cycles, Energy, 2015, 81, 652-661.

 

  1. Das RS, Jain S. Experimental performance of indirect air–liquid membrane contactors for liquid desiccant cooling systems, Energy 57, 319-325, 2013.

 

  1. Jain S. Tripathi S, Das RS, Experimental performance of a liquid desiccant dehumidification system under tropical climates, Energy Conversion and Management 52 (6), 2461-2466, 2011.

 

 

International Conferences

 

1.      Khelkar A, Patwari K, Das RS, Improving the Heat Transfer Performance of a Solar Air Heating Duct with Semicircular Grooves on a Wavy Absorber Plate, 1st International Conference on Mechanical Engineering: Researches and Evolutionary Challenges (ICMECH-REC 23), June 23-25, 2023, National Institute of Technology Warangal.

 

2.      Khelkar A, Patwari K, Das RS, Analysis of a Solar Air Heater with Triangular Fins on Wavy Absorber Plate, Proceedings of the 9th International and 49th National Conference on Fluid Mechanics and Fluid Power (FMFP), December 14-16, 2022, IIT Roorkee.

 

3.      Khelkar A.B., Syrti K., Das R.S., Sarkar B.K., Augmenting the thermal performance of solar air heater with absorber plate roughened with pin-fins. 7th International Conference on Mechanical Engineering and Robotics Research; December 9-11, 2022, Krakow, Poland.

 

4.      Rajive N.M., Khelkar A.B., Das R.S., Simulation of a single zone building in Meghalaya using solar air heater in TRNSYS software. Proceedings of the 1st International Conference in Fluid Thermal and Energy Systems, June 9-11, 2022, NIT Calicut, Kerala, India.

 

5.      Behara D., Das R.S., Thermohydraulic Performance of a Novel Solar-Based Air Heating System, 24th September 2021in the 2nd National and 1st International Conference on Advances in Fluid Flow and Thermal Sciences (ICAFFTS-2021).  September 24- 25, 2021, SVNIT Surat, Surat, India.

 

6.      Das, A., Das, R.S. and Das, K., 2020. Performance evaluation of LiCl and CaCl2 based falling film dehumidifier with surface modification. In Proceedings of the 1st International Conference on Thermal Engineering and Management Advances (ICTEMA 2020).

 

7.      Das, A., Das, R.S. and Das, K., 2019. Performance evaluation and enhancement of LiCl-H2O based falling film dehumidifier using surface modification. In Proceedings of the International Mechanical Engineering Congress (IMEC-2019).

 

8.      Das, A., Das, R.S. and Das, K., 2019. Investigation on Fluid Flow, Heat and Mass transfer Characteristics in a LiCl-H2O Falling Film Absorber. In Proceedings of the 25th National and 3rd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2019). Begel House Inc. December 28-31, 2019, IIT Roorkee.

 

9.      Das S, Debnath B.K., Das R.S., Effect on Combustion Behaviour in the Presence of Ceramic Porous Materials on the Piston Bowl of a Diesel Engine. In Proceedings of the 25th National and 3rd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2019). Begel House Inc. December 28-31, 2019, IIT Roorkee.

 

10.  Bhandarkar A.C., Bezbaruah P.J., Sarkar B.K., Das R.S., “Solar air heater system control for space heating application in Shillong” 8th International and 47th National Conference on Fluid Mechanics and Fluid Power (FMFP 2020), IIT Guwahati. Paper ID: 154”

 

11.  Bezbaruah P.J., Gupta A. K., Das R.S., Sarkar B.K., “CFD analysis of solar collector with truncated hemispherical vortex generators” Proceedings of 14th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics (HEFAT 2019), pp. 265-270. Paper ID: 348, July 21-24, 2019, Wicklow, Ireland.

 

12.  Bezbaruah, P.J., Kumar, R., Das, R.S., “Thermohydraulic performance analysis of solar air heater with helical roughness,” Proceedings of the 25th National and 3rd International ISHMT-ASTFE Heat and Mass Transfer conference (IHMTC-2019), pp. 233-237, 2019

 

13.  Bezbaruah, P.J., Das, R.S. & Sarkar, B.K., "Numerical Analysis of Solar Triangular Air Duct with Conical Turbulators," 2nd International Conference on Power, Energy and Environment: Towards Smart Technology (ICEPE), Shillong, India, pp. 1-5, 2018.

 

14.  Gupta, A.K., Bezbaruah, P.J., Das, R.S. & Sarkar, B.K., “Numerical Investigation on Solar Air Heater with Hemispherical Roughness," 2nd International Conference on Power, Energy and Environment: Towards Smart Technology (ICEPE), Shillong, India, pp. 1-6, 2018.

 

15.  Kushwaha A.K.S., Das R.S., A simplified ANN model to assess the performance of a liquid desiccant air-conditioning system, International Conference on Renewable and Sustainable Energy, April 12-13, 2017, Coimbatore.

 

16.  Das R.S., Saha P.K., Jain S. Investigations on solar energy driven liquid desiccant cooling systems for tropical climates; 50 th Annual Australian Solar Energy Society (AuSES) Solar 2012 Conference, December, 6-7, 2012, Melbourne, Australia.

 

17.  Das R.S., Tripathi S., Jain S. Experimental performance of a liquid desiccant dehumidification system using an indirect contact heat and mass exchanger; Proc. of 5th International sorption heat pump conference, April, 6-8, 2011, Padua, Italy; pp. 725-732.

 

National Conferences                              

  1. Vivek Gaba, Vaibhav Agrawal, Rajat Subhra Das, Sanjeev Jain. Development of solar driven liquid desiccant cooling system; National conference on Advances in Refrigeration and Air-Conditioning (NCARAC-2014), January 27-28, 2014, Bhopal India.
  2. Rajat Subhra Das, Sanjeev Jain. Performance of a solar liquid desiccant cooling system with indirect contact dehumidifier, National conference on refrigeration and air-conditioning, Dec, 12-14, 2013, IIT Chennai, India.
  3. Rajat Subhra Das, Sanjeev Jain. Solar desiccant cooling technologies: Prospects and challenges, National conference on refrigeration and air-conditioning, July, 7-9, 2011, IIT Chennai, India.

 Book Chapters

1.      PJ Bezbaruah, A Das, RS Das, BK Sarkar; Advances in Energy Research; 2020; Numerical Investigation on Triangular Fin-Based Solar Air Heater 341- 350; (ISBN/ISSN No.  978-981-15-2661-9) Springer Nature

2.      PJ Bezbaruah, RS Das, Bikash Kumar Sarkar; Advances in Mechanical Engineering; CFD-Based Study on Thermal and Fluid Flow Dynamics Due to Miller Teeth Shaped Ribs Over Absorber Plate of Solar Air Collector; 1045-1053; (ISBN/ISSN No.978-981-15-0126-5); Springer; 2020

3.      H Barman, RS Das; Advances in Mechanical Engineering; Simultaneous Heat and Mass Transfer Analysis in Falling Film Absorber; 1001-1011; (ISBN/ISSN No.978-981-15-0126-5);Springer; 2020

Administrative Responsibility

  •              Prof-in-Charge, Centre for Career Development from 17.01.2019 to present.

  • Warden (Lapalang 3 and 4 Hostels) from 01.07.2016 to 01.06.2018

    GATE coordinator for TEQIP III 29.05.2019 to 31.03.2022  

    Convener, Invitation & reception sub-committee 10th Convocation of NIT Meghalaya 2023

    Convenor, Invitation Committee, Institution Foundation Day 2023

    Convenor, Invitation Committee, Institution Foundation Day 2024

    Lab in Charge, Computational Lab, 16/11/2022 to present

    Chairman, Industrial Visit Committee10.10.2022 to present

    Faculty Advisor, 17.12.2018 to present

    BTech-MTech Project Coordinator, 01.12.2015 to 01.01.2021

    Preparation of Institute Ranking, Member, from 2015-16

    Exploring International Collaboration and Cooperation, Member, from 2015-16

    Food Committee, Convocation, Member, from 2015-16

    Grade Evaluation Committee, ME, Member, from 2015-16

    Physical Verification of Departmental Stock, Member, from 2015-16

    Screening & Selection Committee for PhD Enrollment, Member, from 2015-16

    Committee for opening quotations for supply of consumables, Member, from 2015-16

    Mentor Faculty for 1st and 2nd year B.Tech Student, Mentor, from 2015-16 

    Screening Committee for TA, ME, Chairman, from 2015-16

    Screening Committee for MTS (Fitter), Member, from 2015-16

    Advisory Committee, Member, from 2016

    Food Committee, Institute Day, Member, from 2016

    Food Committee, Convocation, 2016, Member, from 2016

Awards


Sl No.

Award Details

Year

1

The technical paper entitled “Development of solar driven liquid desiccant cooling system” was awarded ‘Best Paper’ in the National conference on Advances in Refrigeration and Air-Conditioning (NCARAC-2014)

2014


Conferences/Symposia/ Workshops/ Seminars Organised

Title

Sponsors

National/ International

Role

Dates

Controller design and implementation for renewable power generation systems (Hydro, Wind and Solar System)

AICTE

National

Co-Coordinator

07.03.2022-11.03.2022

Confernce/Workshop/Seminar Attended

Conferences:

Sl No.

Name

Period

Place

National/International

1

7th International Conference on Mechanical Engineering and Robotics Research

December 9-11, 2022

Krakow, Poland

International

2

5th International sorption heat pump conference

April, 6-8, 2011

Padua, Italy

International

3

National conference on refrigeration and air-conditioning

Dec, 12-14, 2013

IIT Chennai, India

National

 

Workshops:

Sl No.

Name

Period

Place

National/International

1

Integration of Building Heat Transfer in Engineering Curriculum, sponsored by Indo-Swiss Building Energy Efficiency Project (BEEP),

28-29 August 2021

IIT Bhillai

International

2

Fluid Flow and Heat Transfer in Microchannel

21-22 August, 2014

NIT Agartala

National

3

Advanced Energy and Thermal Systems

2-7 January, 2014

DCRUST, Murthal

National

4

Recent Advances in Micro/Nanoscale Heat Transfer and Applications in Clean Energy Technologies

Dec 21-22, 2013

IIT Ropar

International

5

Renewable Energy for Inclusive Growth & Workshop on Solar Energy Opportunities

1-3 December, 2010

Chandigarh

National

Served as resource person/ expert:

·         Served as a resource person to conduct an interactive session on different aspects of higher studies/ research on 7th June 2022 from 1:00 pm at the Seminar Hall, Department of Energy, Tezpur University. Tezpur 784028, Assam.

·         Served as an expert in the Interview Board Committee for the interview for the Post of Placement Officer in St. Anthony's College, Shillong, held on 28th October 2022.

Keynote address/Invited lectures delivered:

·         Expert lecture delivered on “Solar Based Heating, Cooling and Dehumidification Systems” in the Online self-financed Short-Term Course on 'Emerging Trends in Renewable Energy technologies (ETRET-2022)' organized by the Department of Mechanical Engineering, Motilal Nehru National Institute of Technology (M.N.N.I.T.) Allahabad, Prayagraj-211004, U.P., from 20th to 24th June, 2022.

·         A thematic talk delivered on “Thermohydraulic Performance of a Novel Solar-based Air Heating System” On 24th September 2021 In1st International Conference on “Advances in Fluid Flow and Thermal Sciences (ICAFFTS-2021)” organized by Department of Mechanical Engineering, SVNIT Surat, Gujarat.

Conference sessions chaired:

·         Served as Session Chair at the 4th ICEPE 2022 Organized by Department of Electrical Engineering, National Institute of Technology Meghalaya during 29th April – 01st May, 2022.

Served as external examiner for PhD/ M. Tech/ M. Phil Thesis:

·         Served as an External Expert for Mr. Sandipan Roy (2021AMM019) on his MTech Thesis entitled “Aerodynamics of novel 3D printed biomimicking flapping wing” held on 06-07-2023 through online mode in the Department of Aerospace and Applied Mechanics, IIEST Shibpur, West Bengal, India.

·         Served as an External Expert for Mr. Ankit Kumar (2020AMM028) on his MTech Thesis entitled “Design, fabrication and testing of a 6-component platform balance for measuring aerodynamic forces and moments of a tube launched UAV” held on 11-08-2022 through online mode in the Department of Aerospace and Applied Mechanics, IIEST Shibpur, West Bengal, India.

·         Served as an external examiner for Practical Examination of EN566 Energy laboratory-I practical examinations of M.Tech in Energy Technology Programme, scheduled on 6-7 June, 2022, in the Department of Energy, Tezpur University, Tezpur, Assam, India.

 

Reviewer_Project

Reviewed 04 nos. of DST SERB projects under CRG scheme.