The effect of oil on the onset of nucleate pool boiling of R-124 from a single horizontal tube
Perry, George D.
Memory, Stephen B.
MetadataShow full item record
An investigation on the effect of oil on the onset of nucleate pool boiling of R-124 from a single horizontal tube was conducted at saturation temperature of 2.2 deg C. Pure R-124 and R-124/oil mixtures of 3% and 10% (by weight) miscible alkylbenzene oil were used. The tubes tested were: (1) smooth tube, (2) 19 fins per inch and (3) 26 fins per inch low-integral finned (GEWA-K) tubes, and (4) porous-coated (HIGH FLUX) tube. The effect of dissolved gases, subcooling and pressure on the onset of nucleate boiling were also investigated. An oil concentration of 3% tends to delay the onset of nucleate pool boiling (compared to pure R-124) on the smooth tube and GEWA-K 19 fins per inch tube, but not on the GEWA-K 26 fins per inch and HIGH FLUX tubes. The reason for this is not known precisely but is very repeatable. A 10% oil concentration tends to delay the onset of nucleate pool boiling on all tubes tested. This is due mainly to the increase of surface tension, and saturation temperature with increase in oil concentration. The presence of dissolved gases in the pool tends to lower the onset of nucleate pool boiling by increasing the number of entrapped vapor nuclei. Pressurization and subcooling tend to increase the onset of nucleate pool boiling by deactivating potential nucleation sites.
Approved for public release; distribution is unlimited.
Showing items related by title, author, creator and subject.
Lepere, Victor Joseph Jr. (Monterey, California; Naval Postgraduate School, 1980-12);Experimental results of the heat transfer performance of three enhanced heat transfer surfaces, a Union Carbide, Linde High Flux, a Hitachi Thermoexecl-E, a Wieland Gewa-T, and a plain copper surface in the nucleate boiling ...
Turk, Ugur (Monterey, California. Naval Postgraduate School, 1995-12);In the present study, boiling of highly wetting dielectric fluid has been investigated in an oscillating Fluid environment. A piston is designed to create oscillations in the fluid and over a heated platinum wire. Because ...
Nucleate boiling heat transfer study of direct immersion cooling of a 3x3 array of vertically orientated electronic components in a dielectric fluid Arata, Frank A. (Monterey, California. Naval Postgraduate School, 1992-09);Direct application of two-phase heat transfer in the liquid cooling of electronic components in fluorinated hydrocarbons (FC-72), is severely inhibited by the excessive amount of superheat required to initiate nucleate ...