Review of Pulsating Heat Pipe Working Fluid Selection

Taft, Brent S.; Williams, Andrew D.; Drolen, Bruce L.

doi:10.2514/1.t3768

Cited by 79 publications

(24 citation statements)

References 15 publications

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“…But for ammonia, there is rarely used. Nevertheless, ammonia has much more advantages than these working fluids [36] . It has much higher value of (dp/dT)sat, much lower superheat required for start-up, as shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

Experimental and theoretical research on a ammonia pulsating heat pipe: New full visualization of flow pattern and operating mechanism study

Xue

2017

International Journal of Heat and Mass Transfer

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This paper presents a novel study on performance of pulsating heat pipe using ammonia as working fluid. Firstly, a new full visualization experiment with high speed camera is conducted, to study the relationship between the flow patterns and thermo-hydrodynamics of the PHP. The tested PHP, consisting of 6 turns, is fully made of quartz glass tubes with 6 mm outer diameter and 2 mm inner diameter. The filling ratio for ammonia fluid is 70%. Wall temperature fluctuations of several key positions are recorded under a series charge of heat transfer rates, which are from 25W to 520W. In visualization results, the motion identities, flow pattern variations, breakup and coalescence between the vapor plugs and liquid slugs are illustrated and discussed. In addition, the actual velocity of the vapor is computed from the experimental measurement in this paper, which is never found in other literature but is very important for the mechanism study in theoretical model.Furthermore, a theoretical model including the dynamical characteristics and heat transfer is investigated coupled with the thermal driving force, friction force and capillary force variations as the flow patterns changed at different transport powers, which are derived from the full visualization experiment. The theoretical results are compared with the experimental results analytically, and the operating mechanism of PHP will be discussed in detail finally.

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Section: Methodsmentioning

confidence: 99%

Experimental and theoretical research on a ammonia pulsating heat pipe: New full visualization of flow pattern and operating mechanism study

Xue

2017

International Journal of Heat and Mass Transfer

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“…(21) with g(e), (7) specify r so as to be 2n/co, (8) calculate X from Eq. (27) with w* and z, (9) determine Qc from Eq^ (50) with AT/,, and (10) calculate cw from Eq. (56) with z and Qc.…”

Section: Related Complementary Expressionsmentioning

confidence: 99%

“…More recently, Faghri [8] made a general review on methods of OHP/PHP modeling from a viewpoint of heat pipe science. It is then noteworthy that Taft et al [9] reviewed working fluids to be selected and theoretically established a way of OFIP/ PF1P diameter sizing. Judging from the literature cited above [3][4][5][6][7][8][9], we see that a considerable progress was made in under standing thermodynamically complex behaviors of OHP/PHPs and also that almost no practical expressions helpful in OFDP/PHP design practices are even now presented.…”

Section: Introductionmentioning

confidence: 99%

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

Furukawa

2014

Journal of Heat Transfer

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Various ways developed so far in modeling oscillatinglpulsating heat pipes (OHPsI 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 theoret ically 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 equa tion of pressure oscillation. Finally obtained are closed-form algebraic expressions, providing us with convenient means of predicting the oscillation frequency-andamplitude 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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“…The U.S. Air Force Research Laboratory (AFRL) Space Vehicles Directorate has been investigating OHPs since 2008 (Taft et al 2012;Taft 2013;Taft 2014, Smith et al 2014). In 2012, the original Advanced Structurally Embedded Thermal Spreader (ASETS)…”

Section: Fig 1 Notional Ohp Diagrammentioning

confidence: 99%

Asets-Ii Oscillating Heat Pipe Space Flight Experiment: The First Six Months on Orbit

Taft¹,

Irick²

2019

Frontiers in Heat and Mass Transfer

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On September 7th, 2017 the U.S. Air Force Research Laboratory launched the second Advanced Structurally Embedded Thermal Spreader (ASETS-II) flight experiment to space on Orbital Test Vehicle 5. The ASETS-II experiment is made of three low-mass, low-cost oscillating heat pipes (OHPs) and an electronics/experiment control box. The three primary science objectives of the experiment are to measure the initial on-orbit thermal performance, to measure long duration thermal performance, and to assess any lifetime degradation. The three OHPs on ASETS-II are of varying configuration (center heating with single-and double-sided cooling) and working fluids (butane and R-134a) in order to isolate specific performance parameters of interest. OHP #3 was specifically designed in order to explore the operating limits on OHP operation in microgravity without requiring excessive operating temperature or pressure. Data collected during the first 6 months of on-orbit operations are presented in this paper. It is shown that each OHP performed as expected, where on-orbit data for OHPs #1 and #2 mirrored ground-truth performance, and the OHP #3 on-orbit maximum operating evaporator temperature increased from ground-truth. The OHPs experienced no significant hysteresis effects and OHP #1 performed successfully in six-week long continuous operation.

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Review of Pulsating Heat Pipe Working Fluid Selection

Cited by 79 publications

References 15 publications

Experimental and theoretical research on a ammonia pulsating heat pipe: New full visualization of flow pattern and operating mechanism study

Experimental and theoretical research on a ammonia pulsating heat pipe: New full visualization of flow pattern and operating mechanism study

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

Asets-Ii Oscillating Heat Pipe Space Flight Experiment: The First Six Months on Orbit

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