Surface heat transfer and pressure drop in forced-flow He II

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1989

OSTI ID:6327968

Weisend, II, J G

This thesis investigates the surface heat transfer and pressure drop in forced flow He II. The pressure drop is measured across smooth tubes and corrugated bellows at flow rates of up to 70 g/s. The surface heat transfer measurements are carried out with two different length test sections at mass flow rates of up to 50 g/s and at heat fluxes as high as 10kW/m{sup 2}. The experiments are conducted with He II at 1.8 to 1.9 K and 10{sup 5} Pa. Measurements are also made of centrifugal pump and heat exchanger performance in He II. The results of the experiments show that surface heat transfer into forced flow He II is independent of flow rate and any effects due to thermal entry length are less than 20%. Pressure drop through smooth tubes and bellows as well as pump performance is observed to be the same as for classical fluids. Standard heat exchanger design techniques can not be used with He II heat exchangers. The experiments further indicate that He II flowing at Re {le} 10{sup 5} may be modeled as an ordinary fluid with a very large effective thermal conductivity.

• Research Organization: Wisconsin Univ., Madison, WI (USA)
• OSTI ID: 6327968
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
BELLOWS
CENTRIFUGAL PUMPS
DATA
ENERGY TRANSFER
EXPERIMENTAL DATA
HEAT EXCHANGERS
HEAT TRANSFER
HELIUM 2
HELIUM ISOTOPES
INFORMATION
ISOTOPES
LIGHT NUCLEI
MECHANICAL STRUCTURES
NUCLEI
NUMERICAL DATA
PERFORMANCE TESTING
PUMPS
TESTING
TUBES