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
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|
|Thesis Availability:||Restricted to Caltech community only|
|Defense Date:||13 October 1978|
|Default Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Imported from ETD-db|
|Deposited On:||17 Nov 2006|
|Last Modified:||26 Dec 2012 03:07|
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