In this current project forced convective performance of a dielectric liquid (mineral oil) is experimentally analyzed in a channel with two specially treated hydrophilic surface walls. These specially tailored surfaces are essentially super saturated omniphilic surfaces, that are attached to high flux film heaters. Initial experimental results indicate heat transfer coefficient enhancement. A facile, low-cost, and scalable bulk micro-manufacturing approach is being used to prepare the surfaces and forced convection experiments are performed in a channel with these surfaces.

http://sirelab.nmsu.edu/research/

With increasing demands of better performance of an automobile engine, Cooling systems are one of the critical systems that need attention. With increased capacity to carry away large amounts of wasted heat, performance of an engine is increased. This experimental project investigated the use of hybrid-nanofluids in radiators to increase its heat transfer performance. Graphene based were selected due to the very high thermal conductivity of Graphene. System. The experimental results indicated an 100% increase in the efficiency(>200% in certain conditions). An indian patent application on the same has been filed and is currently under examination. A CFD Analysis of the radiator was also performed by considering a typical element of the automobile radiator( modelled using SEIMENS NX). CFD analysis was conducted using ANSYS FLUENT® for the nanofluid defined and the increase in effectiveness was compared to that of conventional coolants.This was presented and found publication in two international conferences. Usage of such nanofluids for a specified cooling requirement in the future can lead to significant downsizing of the radiator.

* V Krishna, B R Ponangi, K N Seetharamu, T R Seetharam, B R Bharadwaj, S K Mogeraya, M Devaramane,(2017),”Advanced coolant with Nanoparticles”, Indian patent application no.-201741044247,(Pending)

* Bharath R Bharadwaj, K Sanketh Mogeraya, D M Manjunath, Babu Rao Ponangi, K S Rajendra Prasad, V Krishna, “CFD analysis of heat transfer performance of graphene based hybrid nanofluid in radiators”, IOP Conference Series: Materials Science and Engineering, Volume 346-1, 2018.

The need for compactness and efficiency of processing devices has kept increasing rapidly over the past few years, causing the dice to be stacked one above the other in a microelectronic package. This poses challenges of heat dissipation and its characterization due to the presence of multiple heat sources and a single effective heat-conductive path. Hence, it is important to know the distribution and characterization of heat and temperature to provide effective cooling systems. Present work discusses the temperature distribution of various power configurations on stacked dice with five dice, when the dice are in staggered arrangement. The simulations have been carried out for both free convection and forced convection conditions using the ANSYS commercial software. The linear Superposition principle (LSP) is demonstrated on these configurations and validated with the results obtained from ANSYS simulation. LSP can be applied for the quick estimation of die temperatures with negligible error.

Bharath R. Bharadwaj, SriNithish Kandagadla, Praveen J. Nadkarni, V. Krishna, T. R. Seetharam, K. N. Seetharamu, “A Simple Method for Thermal Characterization of Stacked Die Electronic Packages in Staggered Arrangement”, Journal of Microelectronics and Electronic Packaging, v15-3, 117-125, 2018, doi-10.4071/imaps.658722

http://www.imapsource.org/doi/full/10.4071/imaps.658722

Current advancements in electric vehicles are constrained by cooling technologies which have a huge potential for improvement.The current work involved analysis of heat generation, cell level temperature characterization of a single cylindrical 18650 Li-ion cell which is typically used in Electric Vehicles using MATLAB®. Later, for a custom designed battery pack- effect of different thermal management strategies such as passive and active cooling methods are studied. Designs were developed for Air cooling, Liquid Cooling through ducts, Fins for Passive thermal management, Cold Plates for the chosen battery pack. Modelling was carried out on NX 11®. Effects of the proposed thermal management methods were analyzed and compared numerically using ANSYS FLUENT 18.2. ® The best possible thermal management solution among those above, for the designed battery pack under required specifications and operating conditions was presented. Apart from academic research studies, the project also led to funded collaborative projects with two electric mobility startups resulting in two thermal and structural designs for cooling systems used in the industry prototypes of those companies.

Partners for Advancement of Collaborative Engineering Education (PACE) is an industry-academia initiative by General Motors, SIEMENS, ANSYS, HP and many other major engineering corporations in USA with 65 universities from 10 countries. The project for biennial period 2016-2018 was the the Development of PUMA (Personal Urban Mobility Access)- A portable electric vehicle less than 20 kg, designed to improve infrastructure for first-last mile connectivity. Involved in the development of the vehicle "XD" as a part of Team 3- in collaboration with University of Sao Paolo And Institutio De Maua (Brazil), University of RheinMann (Germany), MTU, (USA) and NID Ahmadabad & PES University (India). Initiatives include market survey, customer interaction and resulting design iterations regarding viability and utility of the project, Structural and Thermal Analysis of the battery pack, Design for Manufacturing (DFM),Plant layout and Production Designs as the Team Lead. Awarded in Market Survey (1st-2017&3rd-2018),Design(2nd-2017),Product Engineering(2nd-2018),Manufacturing(2nd-2017&1st-2018) and SIEMENS PLM Excellence award(2018) at PACE Annual Global Forums, Toluca, Mexico(2017) and Michigan, USA(2018).

http://www.pacepartners.org/