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Flow visualization experiment has conducted on the methanol charged vertical Closed Loop Pulsating Heat Pipe (PHP) to investigate the effect of different heat inputs on overall thermal resistance, average evaporator and condenser temperature and corresponding hydrodynamic behavior. A PHP has made from four parallel glass tubes forming adiabatic section, interconnected alternately by copper U tubes, having internal and external diameter 2 mm and 3.06 mm respectively. The length of evaporator, condenser and adiabatic section are 42 mm, 50 mm and 170 mm respectively. For experimentation, filling ratio (FR) 50% and vertical bottom heating mode position was maintained. Electrical heat input to the evaporator varies from 8W to 80W with interval of 8W after steady state was reached. The result shows that, thermal resistance of a PHP rapidly decreases with increasing heating power from 8W to 32W and thereafter reasonably steady for further heating powers. From visualization it is observed that, the thermal performance of a PHP is dependent on the flow patterns in PHP tubes. Continuous unidirectional flow circulation in the tubes of PHP gives best thermal performance than pulsation and dry-out conditions.

THERMO-HYDRODYNAMIC BEHAVIOR OF METHANOL CHARGED CLOSED LOOP PULSATING HEAT PIPE