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Heat Transfer Research
Импакт фактор: 0.404 5-летний Импакт фактор: 0.8 SJR: 0.264 SNIP: 0.504 CiteScore™: 0.88

ISSN Печать: 1064-2285
ISSN Онлайн: 2162-6561

Выпуски:
Том 51, 2020 Том 50, 2019 Том 49, 2018 Том 48, 2017 Том 47, 2016 Том 46, 2015 Том 45, 2014 Том 44, 2013 Том 43, 2012 Том 42, 2011 Том 41, 2010 Том 40, 2009 Том 39, 2008 Том 38, 2007 Том 37, 2006 Том 36, 2005 Том 35, 2004 Том 34, 2003 Том 33, 2002 Том 32, 2001 Том 31, 2000 Том 30, 1999 Том 29, 1998 Том 28, 1997

Heat Transfer Research

DOI: 10.1615/HeatTransRes.2012006193
pages 535-559

NUMERICAL MODELING OF A PULSATING HEAT PIPE WITH HEATING FROM THE TOP

Radha Kanta Sarangi
Mechanical Engineering Department, Don Bosco Institute of Technology, Mumbai-400070, India
M. V. Rane
Mechanical Engineering Department, Indian Institute of Technology, Bombay, Mumbai-400076, India

Краткое описание

A mathematical model of the hydrodynamics and heat transfer in a U-shaped PHP involving one liquid plug and two vapor bubbles is presented. The vapor bubble governing equations and liquid plug energy equation are solved numerically by the explicit finite difference method and explicit IOCV method based on the Lagrangian approach, respectively. Unlike other models, the vapor bubble state is checked, if superheated, the pressure is calculated from the ideal gas equation, otherwise saturation pressure is found from the curve fitted equation. Film thickness is calculated using correlation. The metastable state of a vapor bubble is incorporated by the modified latent heat term. The heat transfer coefficient is calculated by film thickness and spatial film thickness variation which is found by considering evaporation from a liquid film and vapor interface. The model studies different parameters like the plug velocity, bubble temperature and pressure, driving pressure, thermal conductance, and heat transfer. It is observed that film thickness variations are very small in the range from 1 to 3% of the initial thickness due to the higher oscillation frequency in the range from 11 to 13 Hz. The latent heat transfer is 7% of the total heat transfer, in the case of 2-mm ID, water as a working fluid with 80 and 20°C for the evaporator and condenser temperatures, respectively. The heat transfer rate and thermal conductance increase with the temperature difference between the evaporator and condenser, but decrease with decrease in the operating temperature for a given temperature difference between the evaporator and condenser. The vapor sensible heat has significant effects on the vapor bubble temperature.