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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

NUMERICAL SIMULATION OF PULSATING HEAT PIPE WITH SURFACTANT SOLUTIONS

Get access (open in a dialog) DOI: 10.1615/IHTC16.ctm.022279
pages 3639-3645

Résumé

Invented in mid 1990s, Pulsating Heat Pipe (PHP) is a novel, miniaturized and passive heat transferring device that dissipates the heat with the contribution of sensible as well as latent heat transport in oscillating working fluid. The movement of vapor and liquid phases of working fluid inside the tube is promoted by the capillary action. Thermal performance of the PHP is influenced by many parameters like geometry, orientation, working conditions and thermo-physical properties of working fluids. Surface tension is one of the key properties of working fluid which influences the working of the PHP. Lower surface tension value facilities the movement of fluid from evaporator to condenser and vice-versa. In this paper, numerical simulation is carried out to understand the working mechanism of PHP with lower surface tension liquid. The results are compared against our previous experimental results of PHP with Cetyltrimethyl ammonium chloride (CTAC) surfactant solution. With Volume of Fluid (VOF) model adopted to describe the two-phase flow, higher numbers of vapor bubbles are formed with the case of surfactant solution. Generation of vapor and its movement dominated the thermal performance of PHP. Lowered thermal resistance of PHP with surfactant solution is attained at 50% and 65% fill ratios. The poor performance of PHP with 35% filled with surfactant solution is attributed by the higher rate of evaporation compared to condensation.