Heat Transfer in a Compact Tubular Heat Exchanger with Helium Gas at 3.5 MPa

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Abstract:

We have constructed a compact heat exchanger consisting of circular tubes in parallel brazed to a grooved base plate. This tube specimen heat exchanger was tested in an apparatus which radiatively heated the specimen on one side at a heat flux of up to 54 Wcm2, and cooled the specimen with helium gas at 3.5 MPa and Reynolds numbers of 3000 to 35 000. The measured friction factor of the tube specimen was lower than that of a circular tube with fully developed turbulent flow, although our uncertainty was high due to entrance and exit losses. The measured Nusselt number, when modified to account for differences in fluid properties between the wall and the cooling fluid, agreed with past correlations for fully developed turbulent flow in circular tubes.

Author(s):
Olson, Douglas A. ; Glover, Michael P.
Author Organization(s):
NATIONAL INST OF STANDARDS AND TECHNOLOGY BOULDER CO
Pagination:
0065

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):
NISTIR-3941
Monitor Series:
NASA-L
 Subject Terms
Joint Capability Areas:
JCA_1.2.7_Experimentation; JCA_5.3_Planning; JCA_5_Command and Control; JCA_3.2_Engagement; JCA_3_Force Application; JCA_3.2.1_Kinetic Means; JCA_6_Net Centric; JCA_4.6_Engineering; JCA_6.2.1_Information Sharing; JCA_6.2.2_Computing Services; JCA_6.4.1_Secure Information Exchange; JCA_1.2.5_Lessons Learned; JCA_1.4.2_Health Service Delivery; JCA_1.4_Force Support
Modernization Areas:
Hypersonics
Communities of Interest:
Air Platforms
Descriptor(s):
*HEAT TRANSFER, *HEAT EXCHANGERS, HIGH TEMPERATURE, FRICTION, TUBULAR STRUCTURES, TURBULENT FLOW
Field(s)/Group(s):
Air Conditioning, Heating, Lighting and Ventilating, Thermodynamics
Keyword(s):
HELIUM GAS, CIRCULAR TUBES, RADIATIVE FURNACE
Report Date:
1990 Jun 01
Creation Date:
2007 Dec 05