Boiling heat transfer from an excavated fin

✍ Scribed by S.P. Liaw; R.H. Yeh

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 514 KB
• Volume: 19
• Category: Article
• ISSN: 0735-1933
• DOI: 10.1016/0735-1933(92)90033-e

✦ Synopsis

~STRACT

A single pin fin with excavation at base is proposed to enhance boiling heat transfer.

The temperature distribution in the fin is obtained numerically by solving a twodimensional heat conduction equation.

A copper fin boiling in isopropyl alcohol is taken as an example.

When the operating temperature exceeds a specific value, the heat duty decreases drastically, and the whole fin is governed by film boiling.

This highest operating temperature limit (burnout) is raised by digging a hole at the fin base.

Two distinct solutions are found by using different initial guesses into the code. This hysteresis effect becomes noticeable for a bigger hole.

A model is also developed to predict the burnout temperatures. 216