Abstract:
The pulsating heat pipe is the advent of avid progression for the rise of heat transfer
technology, which in a plethora of modern techniques has risen automatically to the
forefront of microelectronics cooling. Recent advances in electronics design and
manufacturing resulted in significant increases in heat flux density through
miniaturization of components and a simultaneous increase in power requirements
associated with increased product functionality. As a result, production of
microelectronics cooling devices will be of optimal importance in the face of scientific
development. A PHP or pulsating heat pipe is essentially a non-equilibrium heat transfer
device whose performance success depends on continuous maintenance of nonequilibrium conditions within the system. A pulsating heat pipe also promises
alternatives for the removal of high localized heat fluxes to provide necessary level of
temperature uniformity across the components that need to be cooled. The heat is thus
transferred not only by latent heat transfer like in other types of heat pipe, but also by
the sweeping of the hot walls by colder moving fluid and vice versa. This phenomenon
is the reason of high efficiency of PHPs in comparison with other heat pipes. The aim of
this research paper is to better understand the operation of PHP through experimental
investigation and obtain comparative results with better for different parameters. A
series of experiments are conducted on a closed loop PHP with 8 loops of copper
capillary tube of 2mm internal diameter. Initially only ethanol was taking as working
fluid, later a blend of ethanol and methanol are used as working fluid and the
corresponding effects on the process parameters are measured. The operating
conditions are the heat input, filling ratio. For both the working fluid, the filling ratios
were taken separately, measure of them being 50%,60%,70%,80%. This paper, shall
primarily demonstrate the effect of different parameters on the closed looped system
and from where the effects of this parameters on the basic heat transfer properties
changes in tis value of the content which is the required or specific target of the
experiment. Important insights of the operational of CLPHP are obtained and optimum
performance and its variation with different working fluid is identified and studied. To
conclude, PHP or CLPHP will remain one of the foremost technology for heat transfer at
low weight and cost.
