Variable-Gravity Effects on A Single-Phase Partially-Confined Spray Cooling System (Postprint)

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Abstract:

This paper discusses the testing of a single-phase spray cooling system that was flown on the NASA KC-135 Reduced-Gravity Research Aircraft. An experimental package, consisting of a spray chamber coupled to a fluid delivery loop system, was fabricated for variable gravity flight tests. The spray chamber contains two opposing nozzles spraying on Indium Tin Oxide ITO heaters. These heaters are mounted on glass posts, which are part of a sump system to remove unconstrained liquid from the test chamber. Thermocouples mounted in and around the posts were used to determine both the heat loss through the underside of the ITO heater and the heat extracted by the spray. During flight tests, for Weber numbers of We 771 plus or minus 19 and 757 plus or minus 15, the non-dimensional heat input was varied from G change 30 to 110 for the non-dimensional grouping Fr12Ga12 20 to 66. Flight test data and terrestrial data were compared to analytical and numerical solutions in order to evaluate the heat transfer in the heater and support structure. In general, the Nusselt number at the heater surface was found to decrease with increasing Fr12Ga12.

Author(s):
Yerkes, Kirk L. ; Michalak, Travis E. ; Baysinger, Kerri M. ; Puterbaugh, Rebekah L. ; Thomas, Scott K. ; Mcquillen, John
Author Organization(s):
AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH PROPULSION DIRECTORATE
Descriptive Note:
Conference paper
Supplementary Note:
Prepared in collaboration with Department of Mechanical and Materials Engineering, Wright State University, Dayton, OH and Microgravity Fluid Physics Branch, NASA Glenn Research Center, Cleveland, OH. Presented at the AIAA Aerospace Sciences Meeting and Exhibit (44th) held in Reno, NV on 9-12 Jan 2006 and published in proceedings as paper AIAA-2006-596.
Pagination:
0017

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
AFRL-PR-WP-TP-2006-237
Task Number(s):
20
Project Number(s):
3145
Monitor Series:
AFRL-PR-WP
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_1.2.7_Experimentation; JCA_1.2_Force Preparation; JCA_1_Force Support; JCA_5.3_Planning; JCA_1.2.3_Educating; JCA_6_Net Centric; JCA_6.1.3_Switching and Routing; JCA_4.6_Engineering; JCA_6.1_Information Transport; JCA_8_Building Partnerships
Modernization Areas:
Microelectronics
Communities of Interest:
Energy and Power Technologies
Descriptor(s):
*COOLING, *GRAVITY, HEAT TRANSFER, SPRAYS, SYMPOSIA, TEST METHODS
Field(s)/Group(s):
Thermodynamics
Keyword(s):
THERMAL MANAGEMENT, VARIABLE GRAVITY, SINGLE PHASE SPRAY COOLING, NUSSELT NUMBER, WEBER NUMBER, SPRAY CHAMBERS, PE62203F, WUAFRL314520C9
Report Date:
2006 Jul 01
Creation Date:
2007 Mar 07