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Experimental investigation of second sound shock waves in liquid helium II

Citation

Rogers, Philip Louis (1979) Experimental investigation of second sound shock waves in liquid helium II. Engineer's thesis, California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-11012006-135258

Abstract

Second sound shock waves in liquid helium II were studied experimentally using superconducting thin film detectors. The temperature waves were generated electrically using an evaporated thin film heater and the effects of variations in pulse power (input power to the heater as large as 150 Watts/cm(2)) and pulse duration (from less than 100 µsec to 10 msec) were examined. A number of different materials were tested for use as detectors with the best results obtained from evaporated gold on tin.

Qualitative agreement with Khalatnikov's theory was obtained; however, breakdown of the theoretical model was observed for heater input powers greater than 20 - 30 Watts/cm(2), in agreement with other known results. Quantitative data for shock strength, i.e., temperature amplitude, wave speed, and pulse power, were obtained. The critical counterflow velocities calculated from these data, w = 2.51 to 3.77 m/sec, indicate that heat fluxes at least an order of magnitude greater than those reported for steady channel flow can be transported using the pulsed techniques.

Item Type:Thesis (Engineer's thesis)
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Aeronautics
Thesis Availability:Restricted to Caltech community only
Research Advisor(s):
  • Liepmann, Hans Wolfgang
Thesis Committee:
  • Unknown, Unknown
Defense Date:13 October 1978
Record Number:CaltechETD:etd-11012006-135258
Persistent URL:http://resolver.caltech.edu/CaltechETD:etd-11012006-135258
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4360
Collection:CaltechTHESIS
Deposited By: Imported from ETD-db
Deposited On:17 Nov 2006
Last Modified:26 Dec 2012 03:07

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