Dr. Karthik Balasubramanian

Assistant Professor

Department of Mechanical Engineering

National Institute of Technology, Warangal - 506004, Telangana, INDIA

: karthikb@nitw.ac.in,karthikjan85@yahoo.com

: 8332969370

Interests: Microchannel Flow Boiling; Phase Change Heat Transfer; Microfluidics; Thermal management; Solar Thermal; Solar PV and Hybrid systems; HVAC systems.

Dr. Karthik Balasubramanian, obtained his B.Tech in Mechanical Engineering from Anna University Chennai, M.Tech in Heat Power Engineering from BIT Mesra, Ranchi and PhD from National University of Singapore, Singapore. He was a Post-Doctoral Fellow at NUS for one year post his PhD. 

Dr. Karthik has worked on microchannel cooling for nearly six years in National University of Singapore (NUS) and has strong expertise in experimental techniques. He has invented novel techniques to minimize pressure drop fluctuations for stable flow boiling with enhanced heat transfer through microchannels and his work is patent pending. He made efforts to mitigate or minimize the flow boiling instabilities using the passive technique of simple modifications in the microchannel geometry. He achieved stable flow boiling and enhanced heat transfer performances and also brought out crucial fundamental understandings about flow boiling in microchannels.

The patent pending technology developed during the course of his PhD was scaled upto fit the thermal management needs of power electronics users like SMRT, Metro trains in Singapore. The project involved both numerical simulation aspects for uniform flow distribution of coolant through the heat sink (cold plate) and experimental investigations to study the actual heat transfer and pressure drop performance of the developed cold plate. Dr. Karthik, joined the Department of Mechanical Engineering, National Institute of Technology Warangal, in the year 2014.

Course Taught Previously

Courses

ME305 - Mechanical Measurements                         - 3rd B.Tech Mechanical

ME401 - Refrigeration and Air-Conditioning       - 4th B.Tech Mechanical

ME362 - Automobile Engineering                               - 3rd B.Tech Mechanical

ME463 - Gas Dynamics                                                      - 4th B.Tech Mechanical

ME576 - Convective Heat Transfer                            - 4th B.Tech Mechanical

 

Labs

Heat Transfer and Fuels Lab

Mechanical Measurements Lab

Energy systems Lab

 

Publications

 International Journals

  1. Law, P. S. Lee , K. Balasubramanian, "Experimental investigation of flow boiling heat transfer in novel oblique-finned microchannels", International Journal of Heat and Mass Transfer, 76 (2014) 419-431. 
  2. K. Balasubramanian , P. S. Lee, S. K. Chou, C. J. Teo, "Flow boiling heat transfer and pressure drop in stepped fin microchannels", International Journal of Heat and Mass Transfer, 67 (2013) 234-252. 
  3. K. Balasubramanian , M. Jagirdar, P. S. Lee, S. K. Chou, C. J. Teo, "Experimental Investigation of Flow Boiling Heat Transfer and Instabilities in Straight Microchannels", International Journal of Heat and Mass Transfer, 66 (2013) 655-671. 
  4. K. Balasubramanian , P. S. Lee, L. W. Jin, S. K. Chou, C. J. Teo, S. Gao, "Experimental investigations of flow boiling heat transfer and pressure drop in straight and expanding microchannels - A comparative study", International Journal of Thermal Sciences, 50 (2011) 2413-2421. 
  5. T. Alam, P. S. Lee , C. R. Yap, L. W. Jin, K. Balasubramanian, "Experimental investigation and flow visualization to determine the optimum dimension range of microgap heat sinks", International Journal of Heat and Mass Transfer, 55 (2012) 7623-7634. 
  6. T. T. Mai, C. Lai, H. Zhendg, K. Balasubramanian, P. S. Lee, "Dynamics of Wicking in Silicon Nanopillars Fabricated with Interference Lithography and Metal-Assisted Chemical Etching" Langmuir, 28 (31) (2012) 11465-11471. 

 International Conferences 

  1. Liril D. Silvi, K. Balasubramanian, "Forced Conjugate Heat Transfer Analysis of Air Cooled Engine under Different Air Velocity and Varying Environmental Conditions", International Conference of Civil, Mechanical and Environmental Engineering (ICCMEET-2016) ISBN 978-1-941505-42-7. 
  2. K. Balasubramanian, P. S. Lee, M N A Hawlader, S. Gao, "Heat transfer characteristics during flow boiling in parallel and oblique finned microchannels", Proc. Of 12th International Conference on Electronics Materials and Packaging (EMAP2010), 25-27 October 2010, Singapore. 
  3. K. Balasubramanian, P. S. Lee, M N A Hawlader, S. Gao, "Pressure Drop characteristics and Instabilities during Flow Boiling in Parallel and Oblique Finned Microchannels - A Comparative Study", 12th Electronics Packaging Technology Conference, EPTC 2010,  IEEE art. no. 5702647, pp. 273-278. 
  4. K. Balasubramanian , P. S. Lee, L. W. Jin, S. K. Chou, C. J. Teo, S. Gao, "Enhanced Heat Transfer and Reduced Pressure Drop Using Stepped Fin Microchannels", 13th Electronics Packaging Technology Conference, EPTC 2011, IEEE 978-1-4577-1982-0/11, pp 653-659. 

 Patent

1. Balasubramanian, K. and Lee, P. S., 2012, "Two-Phase Stepped Fin Microchannel Heat Sink for Enhanced Heat Transfer and Reduced Pressure Drop", PCT Patent Application No.: PCT/SG2012/000416. (https://www.google.com/patents/US20140311725)

PHDs Supervised

 

S.No.        Name of the candidateReg.noResearch areaBatch (year)Status (ongoing/completed)
1Valaparla.Ranjith Kumar715025Thermal management of solar photovoltaicsJuly 2015Ongoing
2Y. Siva Kumar Reddy716014Liquid Desiccant Air condtitioning (Thermal section)January 2016Ongoing

Workshops/Conferences

 Attended

  1. Attended the teaching assistant training program offered by the Center for Development of Teaching and Learning (CDTL) in NUS Singapore. 
  2. Attended the International Engineering Educator Certification Program (IIEECP) organised by the Indo Universal Collaboration for Engineering Education (IUCEE), which was a nine months course. Underwent training in managing large classrooms, course design, effective assessment, student learning styles and effective use of technology for teaching and learning.
  3. Cleared the Microsoft Certified Educator exam.

Projects

 At NIT Warangal

Sl. No.

Title of the Project

Amount

(INR)

Funding Agency

Period

Remarks

1.

Novel cooling techniques and materials for a reliable and efficient solar energy harvester

23.65 Lakhs

DST-SERB

2016-2019

Ongoing

 

­­­­­­­­As Post-Doctoral Fellow at NUS Singapore

Projects involved in

Project Title

 

Funding Agency

 

Amount Awarded in SGD

(S$)

 

Duration of Award

 

Stabilized Two-Phase Micro/Mini-Channel Cooling for Effective Thermal Management of Next Generation Electronics

A*STAR

991,790

08/2010 -  01/2014

Investigations on Microscale Transport Phenomena in Novel Oblique Structures

MOE Tier2

655,335

10/2012 - 09/2015

Stabilized Two-Phase Cooling for Effective Thermal Management of Power Electronics

NRF POC

235,250

02/2013 - 02/2014

 

Flow boiling stabilization in microchannels for effective cooling

Efforts were made to mitigate or minimize the flow boiling instabilities using the passive technique of simple modifications in the microchannel geometry. Two novel geometries, expanding microchannels and the stepped fin microchannels, were studied and benchmarked against straight microchannels. Careful, flow boiling experimental investigations were conducted with high speed visualizations. The heat transfer characteristics, two-phase pressure drop and instabilities in individual geometries were studied in detail and the mechanism of heat transfer was identified and explained based on the existent flow boiling regimes. Achieved stable flow boiling and enhanced heat transfer performances. Also brought out crucial fundamental understandings about flow boiling in microchannels.

­­­­­­­­Stabilized Two-Phase Cooling for Effective Thermal Management of Power Electronics 

The patent pending technology developed during the course of my PhD was scaled up in this project to fit the thermal management needs of power electronics users like SMRT. This project involved both numerical simulation aspects for uniform flow distribution of coolant through the heat sink (cold plate) and experimental investigations to study the actual heat transfer and pressure drop performance of the developed cold plate.

Proposals

Actively participated in drafting several project proposals to various funding agencies in Singapore, three out of which turned out successful, from prestigious funding agencies like Agency for Science Technology And Research (ASTAR), Ministry Of Education (MOE) and National Research Foundation (NRF). The ASTAR project is majorly based on ideas from my doctoral thesis and the NRF project is based on implementation of the patent pending technology that I developed during the course of my PhD, for stable two-phase cooling.

As Research Scholar at NUS Singapore

  1. Worked on experimental investigation of flow boiling through microchannels and studied fundamental aspects of flow boiling characteristics and instabilities through microchannels.
  2. Developed novel geometries to stabilize flow boiling in microchannels.
  3. Obtained a patent for the above as the first inventor.

Awards and Honors

  1.  Helped to secure the prestigious NRF POC grant (worth S$ 2,35,000) for our research group in NUS based on the patent pending technology developed during my PhD.
  2. Participated and helped in securing the ASTAR PSF grant (worth S$1 Million) and the prestigious Ministry Of Education (MOE) Tier 2 grant (worth S$ 6,55,000) for our research group.
  3. Recipient of Graduate Research Scholarship from National University of Singapore, 2008-2012
  4. First Class with Distinction in Master's program.
  5. First Class with Distinction in Bachelor's program.
  6. State Rank 24 for Mechanical Engineering department in Anna University Exam among 4990 students.

Additional Responsibility

Department Level

1. Lab in-charge - Measurements Lab (From 2014 - 15)

2. Faculty adviser - 2nd B.Tech Mechanical (From AY 2015 - 16)

3. Faculty adviser - Go-Kart Team

4. Member - Department Academic Audit Committee (DAAC)

5. Member - FIST project

6. Faculty Treasurer - Mechanical Engineering Association

 

Institute Level

1. Core Team Member - Center for Continuing Education (CCE)

2. Evaluation panel member - EPICS (Engineering Project In Community Service) @ NITW

3. Resource person - TLC