Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
661720 | International Journal of Heat and Mass Transfer | 2007 | 17 Pages |
Abstract
Flow boiling of R-123 in a hydrofoil-based micro pin fin heat sink was investigated. Average two-phase heat transfer coefficients were obtained over effective heat fluxes ranging from 19 to 312Â W/cm2 and mass fluxes from 976 to 2349Â kg/m2Â s. The paper presents a flow map, which divides the data into three flow pattern regions: bubbly, wavy intermittent and spray-annular flows. Heat transfer coefficient trends and flow morphologies were used to infer boiling heat transfer mechanisms. Existing conventional scale correlations for circular tubes resulted in large scatter and were not able to predict the heat transfer coefficients accurately.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Ali KoÅar, Yoav Peles,