EFFECT OF FIN ON THE PERFORMANCE CHARACTERISTICS OF CLOSE AND OPEN LOOP PULSATING HEAT PIPE

Abstract

Pulsating heat pipe (PHP) is a two-phase thermal control device with arbitrary number of turns which is basically used for the thermal management of microelectronic devices as there is a requirement of miniaturization of heat exchangers. To fulfill today’s increasing demand of power electronic applications PHP is a proven technology which works on principle of oscillation of the working fluid and phase change phenomenon in a capillary tube. An experimental investigation has been done on both close and open loop pulsating heat pipes by using suitable working fluid to observe their thermal performance. It has performed on 2 mm inner diameter and 2.5 mm outer diameter open and close loop pulsating heat pipe with fin added on the condensation section. The overall experiment is done by using methanol with 50% filling ratio at 0⁰ (vertical) inclination angle on close loop pulsating heat pipe (CLPHP) and open loop pulsating heat pipe (OLPHP) with 8 loops. In both the pipe evaporation section is 50mm, adiabatic section is 120 mm and condensation section is 80 mm. The main objective of this experiment is to observe the effect of their thermal performance while using fins and without fin i.e. the basic form. The paper attempt theoretical and experimental investigation on the thermo-physical properties of working fluid and will also show the result regarding the significance of using fin on CLPHP and OLPHP. Keywords: PHP, CLPHP, OLPHP, fin with condensation section. Anaerobic treatment of high strength industrial wastewater is a well established industry in the developed world. Along with the treatment of wastewater requiring no aeration and thus being highly energy efficient the byproducts of anaerobic treatment hydrogen and methane gases are sources of clean renewable energy. This paper evaluates the potential of biogas generation in the Bangladesh Military Savar dairy milk processing facility by detailed characterization of the wastewater discharge flow pattern and characterization of the wastewater. A theoretical methane generation evaluation was conducted based on the wastewater flow and waste characterization. This was then related to the potential high value generation in terms of electricity production to show the potential of anaerobic agro based industry wastewater treatment with simultaneous generation of renewable energy.