Research
Area of Interest:
Phase-change heat transfer
Thermal management of electronics and appliances
Heat transfer in micro-gravity
Interfacial dynamics of additives (ionic liquids, surfactants, and nanoparticles)
Role of surface modification and fluid modification on heat transfer
PhD Research Work
Development of a gravity and orientation independent boiling based heat spreader for hot spot mitigation.
Facilitate bubble departure passively during pool boiling irrespective of the heater source orientation and gravity.
Utilize the high heat transfer of boiling for thermal management in space and earth at any heat source orientation.
Device should effectively spread the heat from a small area to a relatively larger area.
Facile fabrication, light weight, and reliable.
Device should be able to tackle any hot spot of 1000 kW/m2.
Bubble dynamics during boiling on earth and in space.
Master of Technology (Research Work)
Bubble dynamics during pool boiling with aqueous surfactant solutions on upward and vertical facing heater.
Bubble departure irrespective of the orientation was demonstrated.
Significant enhancement in heat transfer coefficient was observed.
Schematic of bubble departure during pool boiling with aqueous surfactant solution at different heater orientations.
Schematic of a heat pipe
Bachelor of Engineering (Project Work)
Developed a wicked heat pipe using water as the test fluid.
Analysis were performed using FORTRAN to select a suitable working fluid and dimension of the heat pipe.
Presentations
Presented a paper (oral) entitled "Bubble dynamics and heat transfer during boiling with foaming ionic liquid solution" in International Conference: CHEMCON-2018, 71th Annual Session of Indian Institute of Chemical Engineers held at NIT Jalandhar, India, 27-30 December 2018.
Presented a paper (oral) entitled "Critical heat flux enhancement during subcooled pool boiling with foaming solution" in International Conference: CHEMCON-2018, 71th Annual Session of Indian Institute of Chemical Engineers held at NIT Jalandhar, India, 27-30 December 2018.
Presented a paper (Poster) entitled "Pool boiling critical heat flux enhancement in the absence of buoyancy induced bubble departure" in National Conference: CHFIC-2018, Critical Heat Flux and Multi-phase Flow held at IIT BHU, India, 22-23 December 2018.
Presented a paper (oral) entitled "Pool boiling with aqueous ionic liquid solution for zero gravity applications" in International Conference: IHMTC-2017, 24th National and 2nd International ISHMT-ASTFE Heat and Mass Conference held at BITS Pilani Hyderabad campus, India, 27-30 December 2017.
Presented a paper (oral) entitled "Effect of orientation on pool boiling heat transfer with aqueous surfactant solution" in International Conference: FMFP-2016, 43rd National and 6th International Conference on Fluid Mechanics and Fluid Power held at MNNIT Allahabad, India, 15-17 December 2016.
Presented a paper (oral) entitled "Comparison of bubble behavior and heat transfer during pool boiling with aqueous surfactant solution on upward and downward facing heater" in International Conference: CHEMCON-2015, 68th Annual Session of Indian Institute of Chemical Engineers held at IIT Guwahati, India, 27-30 December 2015.
Presented a poster in Research Scholars Day- 2017 organized by IIT Patna, India.
Workshops and Courses
Successfully completed a GIAN Course on “Boiling Heat Transfer” organised at IIT Guwahati, India, 23 May – 03 June, 2016. Course coordinators: Prof. V.K. Dhir (ULCA), Prof. Gautam Biswas (IIT Guwahati), Prof. Amaresh Dalal (IIT Guwahati)
Successfully completed the basic course on “Remote Sensing, Geographical Information System & Global Navigation Satellite System” conducted by Indian Institute of Remote Sensing, ISRO, Department of Space, Government of India from 10 August – 27 November, 2015.
Participated in a short course on “Phase-Change Thermal Systems” held at BITS Pilani, Hyderabad Campus during 26-27 December, 2017. Course coordinators: Prof. Sameer Khandekar (IIT Kanpur), Dr. Vishwas Wadekar (Consultant, France)
Attended INUP Familiarization Workshop on “Nanofabrication Technologies” organized by IIT Patna, India from 8-9 October, 2015. Course coordinator: Indian Nanoelectronics User Program, IISC Bangalore.
About Thermal and Fluid Transport Laboratory
The Thermal and Fluid Transport Laboratory works under the direction of Dr. Rishi Raj, in the Department of Mechanical Engineering at Indian Institute of Technology Patna. The work in this laboratory mainly focuses on thermal and fluid transport during the liquid-vapor phase change, interfacial interactions, and surface engineering for efficient thermal management of earth and space based applications.
The laboratory has the following facilities:
High Speed Camera (Make: Vision Research, Model: Phantom v7.3)
Infrared Camera (Make: FLIR Model: ORION SC7000)
High Resolution Microscopic Contact Angle Meter (Make: Kyowa, Model: MCA-3)
Fume Hood and Chemical Cabinet with Exhaust (Make: SEMCO Scientific)
Syringe Pump (Make: Cole Parmer, Model: 110)
Hydrophone (Make: B&K, Model: 8103)
Data Aquisition Unit (Make: Keysight Technologies, Model: 34902A)
Data Aquisition Units (Quantity: 2, Make: Agilent, Model: 34972A)
DC Power Supplies (Quantity: 7, Make: Keysight Technologies, Models: N5751A (300V, 2.5A), N5749A (100V, 7.5A), N5743A (12.5V, 60A), U8002A (30V, 5A))
Digital Multimeter (Quantity: 2, Make: Agilent, Model: 34460A)
Workstation (Make: Lenevo, Model: P520C)
Refrigerated and Heating Circulator (Make: SISKIN, Model: PROFI CHILL)
Peristaltic Pump (Make: Cole Parmer, Model: 77200-62)
Ultrasonic Cleaner (Make: Cole Parmer, Model: 08895-67)
Weighing Scale (Make: Mettler Toledo, Model: ME204)
Hot Plate with Magnetic Stirrer (Make: REMI, Model: 10MLH Plus)
Oil Bath (Make: SEMCO Scientific)
Vacuum Pump (Make: Tarsons, Model: Rocker 300)
High Vacuum Pump (Make: Jebivac, Model: V7)
Biomass Gasification Powered Adsorption Refrigeration System (Custom Built)
Pool Boiling Setup (Custom Built)
Flow Boiling Setup (Custom Built)
Vapor Chamber Charging Unit (Custom Built)