000053315 001__ 53315
000053315 005__ 20190316233508.0
000053315 037__ $$aREP_WORK
000053315 245__ $$aLocal Heat Transfer Coefficient Prediction of Substitute Refrigerants with Smooth or Enhanced Surfaces.
000053315 269__ $$a1996
000053315 260__ $$c1996
000053315 336__ $$aReports
000053315 520__ $$aLack of precision and inconsistencies in existing correlations, an attempt was successfully made to develop a new and more mechanistically based correlation (Kattan, 1996 [1]) for boiling inside plain tubes. This new general correlation is original in that it takes into account the effect of two phase flow patterns on evaporative heat transfer. As a first step, the Steiner (1993, [4]) flow map was rewieved and a proposal was made to better account for the transition boundaries between stratified-wavy and annular flow in particular. The importance of the heat flux on the transition between annular flow and annular with partial dryout was identified and original propositions were developed for predicting its occurence, which allows a significantly more accurate prediction of the heat transfer coefficients at high vapor qualities in the boiling process. An extension of the new plain tube correlation is proposed for microfin tubes using enhancement factors which are calculated empirically for the effects of the fins on convective and nucleate boiling contributions to heat transfer.
000053315 700__ $$aZürcher, Olivier
000053315 700__ $$0240152$$g105085$$aFavrat, Daniel
000053315 700__ $$aKattan, Nakhlé
000053315 700__ $$aNidegger, Eric
000053315 700__ $$aThome, John R.
000053315 8564_ $$zURL
000053315 8564_ $$uhttps://infoscience.epfl.ch/record/53315/files/LENI-96-16.pdf$$zn/a$$s741194
000053315 909C0 $$xU10315$$0252044$$pLENI
000053315 909CO $$ooai:infoscience.tind.io:53315$$qGLOBAL_SET$$pSTI$$preport
000053315 937__ $$aLENI-REPORT-1996-016
000053315 970__ $$aLENI-REPORT-1996-016/LENI
000053315 973__ $$sPUBLISHED$$aEPFL
000053315 980__ $$aREPORT