Fundamental studies in blow-down and cryogenic cooling. Interim report, 1 September 1992-1 August 1993

Technical Report · Wed Sep 01 00:00:00 EDT 1993

OSTI ID:7264556

Chow, L C; Lu, W F; Hahn, O J; Sehmbey, M S; Pais, M R

Experiments were conducted to study the free expansion (blow-down) behavior of cryogens. Visualization of the phenomena and determination of the final state of LN2 during free expansion were the main purposes of the study. Results presented show the effect of nozzle size, upstream pressure and downstream pressure. The second part of the study details the experiments conducted to study the heat transfer characteristics during spray cooling with LN2. Four different nozzles at various pressures were used to study the variation in spray cooling heat transfer. Effect of nozzle and flow rate on the critical heat flux and overall heat transfer characteristics are presented. Finally an experiment designed to study the LN2 pool boiling heat transfer from discrete sources in a confined space is described. Blow-down, Supercritical hydrogen, Cryogens, Spray cooling, Jet impingement, Free expansion, Pool boiling.

• Research Organization: Kentucky Univ., Lexington, KY (United States). Dept. of Mechanical Engineering
• OSTI ID: 7264556
• Report Number(s): AD-A-278967/5/XAB; UK-ME-93-04; CNN: F33615--91-C-2152
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CRYOGENIC FLUIDS
BLOWDOWN
THERMODYNAMIC PROPERTIES
FLOW RATE
HEAT TRANSFER
NOZZLES
POOL BOILING
PROGRESS REPORT
BOILING
DOCUMENT TYPES
ENERGY TRANSFER
FLUIDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
661210* - Cryogenics- (1992-)