Heat transfer in a compact tubular heat exchanger with helium gas at 3. 5 MPa
A compact heat exchanger was constructed 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 W/sq cm, 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 the 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.
- Research Organization:
- National Inst. of Standards and Technology, Boulder, CO (USA)
- OSTI ID:
- 5885381
- Report Number(s):
- N-91-17320; NASA-CR-187680; NAS-1.26:187680; PB-91-107573; NISTIR-3941
- Country of Publication:
- United States
- Language:
- English
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Heat transfer in thin, compact heat exchangers with circular, rectangular, or pin-fin flow passages
THE ANALYTICAL DETERMINATION OF THE LOCAL HEAT TRANSFER CHARACTERISTICS OF GASES FLOWING TURBULENTLY IN THE THERMAL ENTRANCE REGION OF A CIRCULAR DUCT WITH LARGE TEMPERATURE DIFFERENCES BETWEENTHE GAS AND THE DUCT WALL
Related Subjects
HEAT EXCHANGERS
DESIGN
HEAT TRANSFER
TUBES
BRAZING
FRICTION FACTOR
HEAT FLUX
HELIUM
NUSSELT NUMBER
PERFORMANCE TESTING
REYNOLDS NUMBER
TURBULENT FLOW
WALLS
ELEMENTS
ENERGY TRANSFER
FABRICATION
FLUID FLOW
FLUIDS
GASES
JOINING
NONMETALS
RARE GASES
TESTING
WELDING
420400* - Engineering- Heat Transfer & Fluid Flow