A Dynamic Film Model of the Pulsating Heat Pipe

This article deals with the numerical modeling of the pulsating heat pipe (PHP) and is based on the film evaporation/condensation model recently applied to the single-bubble PHP (Das et al., 2010, “Thermally Induced Two-Phase Oscillating Flow Inside a Capillary Tube,” Int. J. Heat Mass Transfer, 53(19–20), pp. 3905–3913). The described numerical code can treat the PHP of an arbitrary number of bubbles and branches. Several phenomena that occur inside the PHP are taken into account: coalescence of liquid plugs, film junction or rupture, etc. The model reproduces some of the experimentally observed regimes of functioning of the PHP such as chaotic or intermittent oscillations of large amplitudes. Some results on the PHP heat transfer are discussed.

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Experimental Investigation of Fluid Motion in Pulsating Heat Pipe

Volume 1: Thermal Management ◽

10.1115/ipack2015-48285 ◽

2015 ◽

Cited By ~ 1

Author(s):

Hyung Yun Noh ◽

Sung Jin Kim

Keyword(s):

Heat Transfer ◽

Heat Pipe ◽

Latent Heat ◽

High Speed ◽

Fluid Motion ◽

Pulsating Heat Pipe ◽

Operating Characteristics ◽

Two Phase ◽

Saturation State ◽

Circulation Mode

In this research, operating characteristics and heat transfer phenomena in 2-turn pulsating heat pipe operating in a circulation mode were experimentally investigated. Temperature, pressure and high-speed flow visualization data were obtained with the variation of diameters (1.2 mm, 1.7 mm and 2.2 mm) and input powers. The overall pressure variation from start-up to steady state was measured using the pressure transmitters in the evaporator section. Heat transfer phenomena were investigated using homogeneous-equilibrium model. Thermodynamic state of two-phase mixture at the exit of evaporator is identified as a saturation state using obtained temperature and pressure data. The ratio of sensible heat to latent heat changed with the variation of diameters and input powers. It was found that each evaporator has a different ratio and latent heat was dominant in most experimental cases.

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Heat transfer and flow characteristics of thermally induced two-phase oscillating flow in micro tubes

Journal of Thermal Science and Technology ◽

10.1299/jtst.2016jtst0042 ◽

2016 ◽

Vol 11 (3) ◽

pp. JTST0042-JTST0042 ◽

Cited By ~ 1

Author(s):

Ryusei ISHIDA ◽

Youngjik YOUN ◽

Kenshiro MURAMATSU ◽

Kimio KOHARA ◽

Youngbae HAN ◽

...

Keyword(s):

Heat Transfer ◽

Flow Characteristics ◽

Oscillating Flow ◽

Two Phase ◽

Thermally Induced

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Experimental Investigation of Parameters Affecting Performance of Pulsating Heat Pipe

ASME 2017 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems ◽

10.1115/ipack2017-74119 ◽

2017 ◽

Author(s):

Pawan Singh Kathait ◽

Rajnish N. Sharma

Keyword(s):

Heat Pipe ◽

High Efficiency ◽

Electronics Cooling ◽

Heat Fluxes ◽

Pulsating Heat Pipe ◽

Two Phase ◽

Suitable Candidate ◽

Thermally Induced ◽

Large Heat ◽

Efficient Heat Transfer

Pulsating heat pipe (PHP) is a two phase highly efficient heat transfer device, due to its simple and flexible construction; it can be manufactured for a variety of applications. PHP works on thermally induced self-sustaining oscillation of liquid plugs and vapor slugs, so it does not have any moving parts either. Ease of manufacturing, potential for high efficiency at different scales and the ability to handle large heat fluxes has the PHP a suitable candidate for microscale electronics cooling or power electronics cooling. However, this technology is still in developing phase and there is at present no comprehensive model which can be used to design a PHP for a specific application. There are many parameters which affect PHP operation and a thorough understanding of the relation between all the variables is first required. The present study is an attempt to investigate experimentally the effects of various parameters on PHP startup, based on startup temperature measurements under varying heat input and carefully controlled conditions. It has been observed that the oscillations in PHP start (startup) as soon as it reaches a minimum temperature corresponding to the minimum Etvos number required for vapor bubble rise.

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Thermally induced two-phase oscillating flow inside a capillary tube

International Journal of Heat and Mass Transfer ◽

10.1016/j.ijheatmasstransfer.2010.05.009 ◽

2010 ◽

Vol 53 (19-20) ◽

pp. 3905-3913 ◽

Cited By ~ 50

Author(s):

S.P. Das ◽

V.S. Nikolayev ◽

F. Lefevre ◽

B. Pottier ◽

S. Khandekar ◽

...

Keyword(s):

Capillary Tube ◽

Oscillating Flow ◽

Two Phase ◽

Thermally Induced

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MAJOR TEN PARAMETERS OF PULSATING HEAT PIPE- A REVIEW

INFORMATION TECHNOLOGY IN INDUSTRY ◽

10.17762/itii.v9i2.463 ◽

2021 ◽

Vol 9 (2) ◽

pp. 1134-1138

Author(s):

Bukke Nagamuni Naik, Et. al.

Keyword(s):

Heat Transfer ◽

Heat Pipe ◽

Electronic Device ◽

Pulsating Heat Pipe ◽

Heat Management ◽

Two Phase ◽

Space Applications ◽

Working Principle ◽

Solar Heater ◽

Modern Era

Thermal Management in the present issue in the modern era. The technology in heat transfer day by day is increased gradually especially in electronic device, space applications, hybrid vehicles, solar heater. These are the major areas where heat management are successfully research is going on Pulsating Heat Pipe is a two phase device where the heat transfer is takes place through sensible and latent heat. This paper gives an over review of the Pulsating heat pipe design, working principle, parameters which effects the PHP, dryout condition and applications where PHP is used successfully research is going on. This paper addresses the fundamentals of PHP, an overview, and the applications of PHP.

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