Accession Number : ADA549369


Title :   Physics-Based Modeling and Measurement of High-Flux Condensation Heat Transfer


Descriptive Note : Final rept. 1 Oct 2008-3 Sep 2011


Corporate Author : PURDUE UNIV LAFAYETTE IN


Personal Author(s) : Mudawar, Issam ; Kim, Sung-Min ; Kim, Joseph


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a549369.pdf


Report Date : Sep 2011


Pagination or Media Count : 109


Abstract : This report examines condensation of FC-72 along parallel, square micro-channels with a hydraulic diameter of 1 mm and a length of 29.9 cm, which are formed in the top surface of a solid copper plate. Using high-speed video imaging and photomicrographic techniques, five distinct flow regimes are identified: smooth-annular, wavy-annular, transition, slug, and bubbly, with the smooth-annular and wavy-annular regimes being most prevalent. A theoretical control-volume-based model is proposed based on the assumptions of smooth interface between the annular liquid film and vapor core, and uniform film thickness around the channel's circumference. The new model accurately captures the pressure drop and heat transfer coefficient data in both magnitude and trend, evidenced by mean absolute error values of 3.6% and 9.3%, respectively.


Descriptors :   *CONDENSATION , *HEAT TRANSFER , HEAT TRANSFER COEFFICIENTS , HYDRAULICS , PHOTOMICROGRAPHY , SOLID PHASES , THERMAL CONDUCTIVITY , THICKNESS , TWO PHASE FLOW


Subject Categories : Thermodynamics


Distribution Statement : APPROVED FOR PUBLIC RELEASE