Experimental investigations on operating characteristics of a closed loop pulsating heat pipe

doi:10.1007/s11708-015-0354-x

Front. Energy

2015, Vol. 9

Issue (2) : 134-141 https://doi.org/10.1007/s11708-015-0354-x

RESEARCH ARTICLE

Experimental investigations on operating characteristics of a closed loop pulsating heat pipe

Yu WANG(

)

School of Energy and Safety Engineering, Tianjin Chengjian University, Tianjin 300384, China

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Abstract

The operating mechanism of the pulsating heat pipe (PHP) is not well understood and the present technology cannot predict required design parameters for a given task. The aim of research work presented in this paper is to better understand the operation regimes of the PHP through experimental investigations. A series of experiments were conducted on a closed loop PHP with 5 turns made of copper capillary tube of 2 mm in inner diameter. Two different working fluids viz. ethanol and acetone were employed. The operating characteristics were studied for the variation of heat input, filling ratio (FR) and inclination angle of the tested device. The results strongly demonstrate the effect of the filling ratio of the working fluid on the operational stability and heat transfer capability of the device. Important insight into the operational characteristics of PHP has been obtained.

Keywords closed loop pulsating heat pipe thermal performance operation limit thermography

Corresponding Author(s): Yu WANG

Just Accepted Date: 09 February 2015 Online First Date: 18 March 2015 Issue Date: 29 May 2015

Cite this article:

Yu WANG. Experimental investigations on operating characteristics of a closed loop pulsating heat pipe[J]. Front. Energy, 2015, 9(2): 134-141.

URL:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-015-0354-x
https://academic.hep.com.cn/fie/EN/Y2015/V9/I2/134

Fig.1 Schematic of PHP experimental set-up

Tab.1 Performed experiments

Fig.2 Comparison of thermal performance of CLPHP with ethanol and acetone

(a) FR= 35%; (b) FR= 53%; (c) FR= 70%

Fig.3 Heat transfer limit in Test-a

Fig.4 Unstable operation in Test-d

Fig.5 Influence of inclination variations on operation stability in Test-b2

Fig.6 Influence of inclination variations on operation stability in Test-d2

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