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Research Papers: Two-Phase Flow and Heat Transfer

Rationalized Concise Descriptions of Fluid Motions in an Oscillating/Pulsating Heat Pipe

[+] Author and Article Information
Masao Furukawa

Department of Electrical Systems Engineering,
Kogakuin University,
1-24-2, Nishi-Shinjuku, Shinjuku-ku,
Tokyo 163-8677, Japan
e-mail: au40740@ns.kogakuin.ac.jp

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received September 16, 2013; final manuscript received April 7, 2014; published online May 28, 2014. Assoc. Editor: Bruce L. Drolen.

J. Heat Transfer 136(9), 092901 (May 28, 2014) (11 pages) Paper No: HT-13-1488; doi: 10.1115/1.4027553 History: Received September 16, 2013; Revised April 07, 2014

Various ways developed so far in modeling oscillating/pulsating heat pipes (OHPs/PHPs) are briefly reviewed to find which way would be serviceable for design purposes and also be helpful to mathematically plainly describe oscillatory/circulatory motions of the charged working fluid. A selected way basically follows Ma's approach but a theoretically new attempt is made to derive the oscillation angular frequency ratio from two differently represented expressions of the oscillation velocity. A two-phase flow and evaporative/condensing heat transfer analysis is then carried out to get the wave equation of pressure oscillation. Finally obtained are closed-form algebraic expressions, providing us with convenient means of predicting the oscillation frequency- and-amplitude and the wave velocity. To demonstrate the applicability of those expressions, numerical comparisons are extensively done between our predictions and many other ones.

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References

Figures

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Fig. 1

Closed-loop oscillating/pulsating heat pipe

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Fig. 2

Temperature differences in evaporator or condenser versus heat load

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Fig. 3

Maximum temperature difference versus heat load

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Fig. 4

Oscillation velocity versus heat load

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Fig. 5

Angular frequency ratio versus heat load

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Fig. 6

Oscillation frequency versus heat load

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Fig. 7

Oscillation amplitude versus heat load

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Fig. 8

Wave velocity versus heat load

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Fig. 9

(a) Wave to sonic velocity ratio versus heat load. (b) Reference wave velocity to sonic velocity ratio versus heat load.

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