Ashok T. Pise

A review of heat pipe with nanofluid for electronic cooling

A heat pipe is an important tool for effective cooling performance of the electronic devices. The main focus of this paper is to review applications of heat pipe in electronic system. Miniaturization of chips and increasing processing speed decreases the heat transfer surface area and generates very high heat fluxes resulting in large temperature rise in electronics devices. Therefore, for an effective cooling heat pipe is a better selection because of its high efficiency and reliability. A major part of this review paper is allocated to applications of different types of heat pipe and modern trends in heat pipe technology. Nanofluids are dilute suspensions of nanoparticles composite materials with the specific aim of increasing the thermal conductivity of heat transfer fluids. Authors also analyzed some of the applications of heat pipes with nanofluid for electronic cooling.

Numerical Analysis of Flow Behavior in Vortex Tube for Different Gases

The vortex tube is an energy separation device that separates compressed gas stream into a low and a high temperature stream. Present work reports the flow behavior inside the vortex tube for different commonly used fluids with varied properties like Air, He, N2, CO2 and NH3. Flow behavior investigation for three-dimensional short straight-diverging vortex tube is done with CFD code (ANSYS 16.0). Different turbulent models, standard k-epsilon, Realizable k-epsilon and RNG k-epsilon are tested. Realizable k-epsilon model was then used for analysis. Flow behavior of gases with varied multi-atomic number is analyzed and compared with literature. The effect on temperature for N2 is found to be better, followed by He, CO2, Air and NH3. Energy separation for N2 is 46 % higher than all other gases. Energy separation and flow behavior inside vortex tube is analyzed and compared with literature.

An Experimental Investigation of Heat Pipe Flat-Plate Solar Collector with Water-Ethanol Mixture as a Working Fluid

The objective of the present study is to investigate the performance of solar collector with serpentine shape of heat pipe and water-ethanol as a working fluid. Serpentine shape is easy of manufacturing and also to reduce cost of manufacturing. In this work, heat pipe is made from copper tube having ID 10mm and OD 12mm.The tube is bent in serpentine manner and filled with Water-ethanol as a working fluid with 70% filling ratio. The length of evaporator, adiabatic and condenser section was 480mm, 50mm and 65mm respectively. The test is conducted for coolant flow rate 4.5 kg/hr different angle of collector 20°, 31.5°, 40°, 50°, 60°. Result shows that water-ethanol collector gives better performance than collector with water as a working fluid. Maximum efficiency is observed at 31.5° inclination.