Effects of eddy diffusivity in film condensation on a horizontal tube

✍ Scribed by Hai-Ping Hu; Cha'o-Kuang Chen

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 312 KB
• Volume: 34
• Category: Article
• ISSN: 0735-1933
• DOI: 10.1016/j.icheatmasstransfer.2006.09.007

✦ Synopsis

It is an investigation into turbulent film condensation on a horizontal tube. In order to forecast the results more exactly, a new theory model of local film shear stress (τ / τ w ) is presented in the paper. In the study, four models of different eddy diffusivity are considered. The numerical calculation is obtained by using Visual C ++ . The result shows that among the four models, the difference between the higher value and the lower value of the mean Nusselt number is about 10.1%. Besides, the results developed in the current study are compared with those generated by previous theoretical results. The result shows that the present paper considering film local shear has a higher mean Nusselt number than the previous ones that exclude the film local shear.