Effect of Filling Ratio on Heat Transfer Characteristics and Performance of a Closed Loop Pulsating Heat Pipe

“…Previous experimental works have focused on the heat transfer mechanism and on the visualizations of flow patterns. It´s generally agreed, J. Qu et al [5], H. Barua et al [6], that the thermal performance and the flow regime of OHP depends on the effects of the working fluid, filling ratio (FR), power input, operating orientation and different geometries. The working fluid is commonly the most effective parameter to improve the thermal performance of heat pipes [7] The difference between the power supplied in the evaporator zone and the heat released from the condenser part is usually less than 5% [8].…”

Section: Introductionmentioning

confidence: 86%

Design and study of a Flat Plate Oscillating Heat Pipe. Flow Pattern analysis and Heat Transfer Performance

Cal¹,

Vishak²

2017

REPQJ

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Abstract. Recent and constant demands for greater power densities and smaller sizes of electronic systems have stimulated the growth of new designs of different passive heat transfer methods such as heat pipes. Particularly, Oscillating Heat Pipes (OHPs) are relatively novel devices, capable of removing high heat rates over long and short distances with not much temperature drop. Its heat transfer mechanism relies on a self-oscillating motion of a two-phase flow of a working fluid circulating through meandering channels. This study concentrates on the design, building and assembling a test rig in order to analyse the flow pattern of deionised water through a 5 turns Flat Plate Oscillating Hat Pipe under different heat inputs, which was made in the School of Engineering and Materials Science of the Queen Mary University of London by two PhD students. The filling ratio of the water is 40%. Furthermore an experimental study on the OHP thermal performance is carried out in order to examine the effects of different surface wet conditions: super hydrophilic, hydrophilic and cleaned brass. It is demonstrated the formation of liquid slugs and vapour plugs of the water along the channels. The experimental results showed that the hydrophilic surface tend to be more energy efficient. The heat transfer performance of the superhydrophilic and hydrophilic is higher than brass by 5-12% and 15-20% respectively

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“…Reasonable particle volume fraction is about 0.5-1% [4] . Himel Barua et al (2013) Had investigated Heat pipe at different Heat input, filling ratio & fluid as water and Ethanol. For low Heat water is better working fluid than ethanol at wide range of F.R.…”

Section: IImentioning

confidence: 99%

Influence of Working Fluids on Thermal Performance of Flat Plate Oscillating Heat Pipe

Gamit¹

2019

IJRASET

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With development of higher electronic devices, there is a need for better thermal management. The heat output of these devices can potentially exceed the heat transfer capabilities of current heat pipe designs. Oscillating heat pipes (OHPS) have high heat spreading performance and are capable of removing higher heat fluxes. OHP is superior compared to traditional heat pipes and can be used to solve the future cooling problems. This study presents the thermal performance of Flat plate oscillating heat pipe (OHP) using different working fluids with mini channels. The FP-OHP were fabricated with the channels of square cross section which had hydraulic diameters of 2 mm in mini channels. The performance of the FP-OHP will be measured and analysed by keeping 50% filling ratio, vertical position and varying input power and with different working fluids.

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Effect of Filling Ratio on Heat Transfer Characteristics and Performance of a Closed Loop Pulsating Heat Pipe

Cited by 55 publications

References 4 publications

Experimental investigation on thermal performance of phase change material coupled with closed-loop oscillating heat pipe (PCM/CLOHP) used in thermal management

Experimental investigation on thermal performance of phase change material coupled with closed-loop oscillating heat pipe (PCM/CLOHP) used in thermal management

Design and study of a Flat Plate Oscillating Heat Pipe. Flow Pattern analysis and Heat Transfer Performance

Influence of Working Fluids on Thermal Performance of Flat Plate Oscillating Heat Pipe

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