Heat Transfer for Laminar Flow in Partially Heated Tubes

Journal Article

Zeitoun, O. . 2002

• المجلة \ الصحيفة: Alexandria Engineering Journal
• رقم العدد: 2
• رقم الإصدار السنوي: 41
• الصفحات: 205-212

مستخلص المنشور

Fully developed laminar convective heat transfer in a partially heated pipe was investigated. The tube was assumed to be heated along a peripheral angle eh while the rest of its surface was assumed to be adiabatic. Two different heating conditions were investigated; uniform temperature and uniform heat flux along the heated surface. The governing equations have been solved numerically using finite volume technique to obtain the temperature distribution and heat transfer coefficient represented by Nusselt number. Effect of the angle of the heated surface on the heat transfer process was investigated. The values of Nusselt number for various heating angles were obtained. The analysis shows a decrease of Nusselt number as the angle of the heated portion of the tube surface increases. As it is expected Nusselt number approaches the known values of completely heated tubes for uniform wall-temperature and uniform wall-heat flux.