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Flow Visualization and Stream Temperature Measurement of Liquid Hydrogen Line Chill Down Experiments

[+] Author and Article Information
Dr. Jason Hartwig

NASA Glenn Research Center, Propulsion and Propellants, Cleveland, OH 44135
Jason.w.hartwig@nasa.gov

Jeremy Styborski

Turbine Durability, Hot Section Engineering, Pratt & Whitney, East Hartford, Connecticut, 06118, United States
jeremy.styborski@gmail.com

Corresponding author.

J. Heat Transfer 137(2), 020904 (Feb 01, 2015) Paper No: HT-14-1606; doi: 10.1115/1.4029014 History: Received September 09, 2014; Revised September 10, 2014; Online November 25, 2014

Abstract

A thermally representative tank-to-tank transfer line was designed and tested at SMiRF at NASA Glenn to simulate liquid hydrogen transfer from a Low Earth Orbit depot storage tank to a customer receiver tank. The line was equipped with three external skin silicon diode measurements, one internal stream temperature measurement, and a high speed imaging system to view flow profiles as the system chilled down from 250K to LH2 temperatures. Image: Two phase flow video stills correlated with temperature measurements shows the time evolution of chill down. Skin measurements indicate chill down is nearly complete within 20s due to annular flow and liquid layer along wall, but internal stream temperature doesn't bottom out until >140s due to bubbly flow. Majority of chill down is spent in annular and bubbly flow regimes. SD1-3 are successive skin diodes mounted along the transfer line.

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