Effect of Alcohols Thermal Resistance of Closed Loop Pulsating Heat Pulsating Heat Pipe (CLPHP)’

Abstract

The emergence of pulsed heat pipe heat transfer technology has led to exciting advances, leading the way in automated microelectronic cooling in many modern technologies. Recent advances in electronic product design and manufacturing have resulted in significant increases in heat flux densities through component miniaturization and concurrent increases in power requirements associated with increased product performance. Therefore, before the development of science, microelectronics will be more and more important for cooling devices, heat exchanges, cell cold storage, spacecraft. The PHP or pulsed heat pipe is essentially an unbalanced heat transfer device whose success depends on the constant maintenance of unbalanced conditions in the system. A pulsed heat pipe promises highly localized heat rejection options to provide the required degree of temperature uniformity for the components that need to be cooled. Thus, heat is transferred not only by latent heat transfer as in other types of heat pipes, but also through the hot wall by the cold moving liquid and vice versa. This phenomenon is the reason for the high efficiency of PHP compared to other heat pipes. The goal of this research paper is to better understand the performance of PHP through experimental investigation and get better comparison results for different parameters. A series of tests were performed on a PHP closed loop with 4 rings of copper capillary tubes with an inner diameter of 2 mm. Initially, propanol, ethanol, butanol, water was taken as the active fluids and the respective effects of the process parameters were measured. The operating conditions are heat input, fill rate. For both working fluids, the fill rates are taken separately, their measurements are (10%, 30%, 50%). This paper will initially demonstrate the influence of different parameters on a closed-loop system and hence the influence of these parameters on the basic heat transfer characteristics that alter the TIS value of the object, which is required or specific objective of the experiment. Important insights into the operational aspects of CLPHP are identified and studied for its optimal performance and variability with different working fluids. In conclusion, PHP or CLPHP will remain one of the leading technologies for heat transfer with low weight and cost.