Spray Cooling Under Reduced Gravity Condition

Yoshida, Kenzo; Abe, Yoshiyuki; Oka, Tetsuo; Mori, Yasuhiko H.; Nagashima, Akira

doi:10.1115/1.1345887

Cited by 72 publications

(48 citation statements)

References 15 publications

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“…For the unconfined spray, the vertical spray is slightly more efficient than the horizontal spray at a flow rate of 6.2 GPH. This is opposite to trends observed by Kato, et al (1994) and Yoshida, et al (2001). At 9.3 GPH, the opposite trend is observed for the unconfined flow.…”

Section: Experiments Without Electrical Forcescontrasting

confidence: 50%

“…Yoshida, et al (2001) found that spray cooling in the nucleate boiling regime was more effective in simulated microgravity (jig) than in terrestrial gravity when water was used, but when the commercial coolant FC-72 was used, only a slight improvement was seen. Yoshida et al simulated jig conditions by rotating their apparatus 180 degrees, changing the direction of the heated surface from upward facing to downward facing.…”

Section: )mentioning

confidence: 99%

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Electromagnetic Control of High Heat-Flux Spray Impingement Boiling Under Microgravity Conditions

Gray¹,

Kuhlman²,

Glaspell³

et al. 2007

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources. gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this cOllectioni of information, including suggestions for reducing this burden to Departnient of Defense. Washington Headquarters Services, Directorate for Information Operations and . 1215 Jefferson Davis Highway, Suite 1204, Arlington. VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information i it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY)2. REPORT TYPE 14. ABSTRACT The primary goal of this project was to discover how to most effectively use electromagnetic forces to enhance spray impingement boiling heat transfer in microgravity (jg). This project was closely coordinated with the non-electromagnetic spray impingement boiling experiments conducted by Dr. Kirk L. Yerkes of the Air Force Research Laboratory (AFRL) . The West Virginia University (WVU) investigation of electrical body forces to enhance and control spray impingement boiling extended the AFRL research. The computational phase of the WVU project was based on the commercial multiphysics code CFD-ACE+, which was successfully modified to incorporate the Coulomb and electric Kelvin forces. DATES COVERED (From -ToWVU's ground-based experiments demonstrated for the first time that modest increases in heat transfer coefficient and Nusselt number can be achieved in spray impingement boiling by using electrical forces, thus confirming the fundamental hypothesis of this research.Further increases in heat transfer performance are likely to result from a better understanding of the relevant microphysics and better electrode designs. Experimental results have been used to estimate the time scales for various phenomena that occur in spray impingement boiling, which could lead to improved electrode designs. SUBJECT ABSTRACTThe primary goal of this project was to discover how to most effectively use electromagnetic forces to enhance spray impingement boiling in microgravity (ýLg). This project was closely coordinated with the non-electromagnetic spray impingement boiling heat transfer experiments conducted by Dr. Kirk L. Yerkes of the Air Force Research Laboratory (AFRL). The West Virginia University (WVU) investigation of electrical body forces to enhance and control spray impingement boiling extended the AFRL research. The computational phase of the WVU project was based on the commercial multiphysics code CFD-ACE+, which was successfully modified to incorporate the Coulomb and electric Kelvin forces. WVU's ground-based experiments demonstrated for the first time that modest increases in heat tra...

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Section: Experiments Without Electrical Forcescontrasting

confidence: 50%

Section: )mentioning

confidence: 99%

Electromagnetic Control of High Heat-Flux Spray Impingement Boiling Under Microgravity Conditions

Gray¹,

Kuhlman²,

Glaspell³

et al. 2007

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“…Several microgravity spray cooling experiments were performed by Yoshida 6 and Kato 7 . The experiments looked at both transient and steady state spray cooling in microgravity during reduced gravity aircraft flights.…”

Section: American Institute Of Aeronautics and Astronauticsmentioning

confidence: 99%

“…To be effective, these proposed thermal management approaches must operate in extreme space environments. Several thermal management approaches have been or are being considered for space environments such as jet impingement 1 , two phase flow and heat transfer 2 , pool boiling 3,4,5 , and spray cooling 6 . An analytical and experimental study performed by Labus 1 determined the free surface shape of a jet impinging on an unheated flat disk in microgravity, Fig.1.…”

Section: Introductionmentioning

confidence: 99%

Design of a Microgravity Spray Cooling Experiment

Basinger

Yerkes

Michalak

et al. 2004

42nd AIAA Aerospace Sciences Meeting and Exhibit

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Department of Defense, Washington Headquarters Services, Directorate for Information AFRL-PR-WP-TP-2006-240 SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSORING/MONITORING AGENCY ACRONYM(S) AFRL-PR-WP ABSTRACTAn analytical and experimental study was conducted for the application of spray cooling in a micro gravity and high-g environment. Experiments were carried out aboard the NASA KC-135 reduced gravity aircraft, which provided both the microgravity and high-g environments. In reduced gravity, surface tension flow was observed around the spray nozzle, due to unconstrained liquid in the test chamber and flow reversal at the heat source. A transient analytical model was developed to predict the temperature and the spray heat transfer coefficient within the heated region. Comparison of the experimental transient temperature variation with analytical results showed good agreement for low heat input values. The transient analysis also verified that thermal equilibrium within the heated region could be reached during the 20-25s reduced gravity portion of the flight profile. ABSTRACT An analytical and experimental study was conducted for the application of spray cooling in a microgravity and high-g environment. Experiments were carried out aboard the NASA KC-135 reduced gravity aircraft, which provided both the microgravity and high-g environments. In reduced gravity, surface tension flow was observed around the spray nozzle, due to unconstrained liquid in the test chamber and flow reversal at the heat source. A transient analytical model was developed to predict the temperature and the spray heat transfer coefficient within the heated region. SUBJECT TERMS

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“…Sone et al [9] and Yoshida et al [10] showed that during microgravity (using FC-72), the critical heat flux (CHF) increased by 14% at the center of the heater. Their studies also showed a decrease in heat transfer along the peripheral due to the reduction in gravity.…”

Section: Expected Resultsmentioning

confidence: 99%

Centrifuge Testing of a Partially-Confined FC-72 Spray

Elston¹,

Yerkes²,

Fleming³

et al. 2006

SAE Technical Paper Series

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Department of Defense, Washington Headquarters Services, Directorate for Information AFRL-PR-WP-TP-2007-209 SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSORING/MONITORING AGENCY ACRONYM(S) AFRL-PR-WP ABSTRACTThe effects of elevated acceleration fields on spray cooling heat transfer are discussed in this paper. Spray cooling has proven to be one of the most efficient methods of heat removal. This technology is being transitioned into more advanced applications, such as fighter aircraft that must withstand a wide range of variable acceleration-induced body forces. Heat transfer associated with closed-loop spray cooling will be affected by acceleration body forces, the extent of which is not yet known. To test these various effects, an eight-foot-diameter centrifuge table will be outfitted with a spray cooling system to test for the effects associated with elevated gravity. ABSTRACTThe effects of elevated acceleration fields on spray cooling heat transfer are discussed in this paper. Spray cooling has proven to be one of the most efficient methods of heat removal. This technology is being transitioned into more advanced applications, such as fighter aircraft that must withstand a wide range of variable acceleration-induced body forces. Heat transfer associated with closed-loop spray cooling will be affected by acceleration body forces, the extent of which is not yet known. To test these various effects, an eightfoot-diameter centrifuge table will be outfitted with a spray cooling system to test for the effects associated with elevated gravity.

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Spray Cooling Under Reduced Gravity Condition

Cited by 72 publications

References 15 publications

Electromagnetic Control of High Heat-Flux Spray Impingement Boiling Under Microgravity Conditions

Electromagnetic Control of High Heat-Flux Spray Impingement Boiling Under Microgravity Conditions

Design of a Microgravity Spray Cooling Experiment

Centrifuge Testing of a Partially-Confined FC-72 Spray

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