Non-darcian effects on the heat-pipe wicking limit

• Autorzy: Ozguc A. F.
• Języki publikacji: EN

Abstrakty

EN

This paper investigates the non-Darcian effects, i.e., the wall, the inertial, the variable porosity, and the interfacial shear effects, on the wicking limit of a heat-pipe. It is shown that the presence of the pipe wall reduces the liquid flow rate in the wick and results in a lower wicking limit than that predicted by Darcy's law. At high heat loads, the liquid velocity in the wick may reach a magnitude such that the inertial effect needs to be considered. This inertial effect, in general, brings the wicking limit further down. The vapor shear exerted on the wick flow can also significantly lower the wicking limit as the aspect ratio becomes smaller. For sintered-sphere wicks, the porosity variation near the wall results in flow channelling and, consequently, a greater wicking limit is attained. Parameters such as the Darcy number, the Reynolds number, and the aspect ratio are found significant for the prediction of the wicking limit.

Słowa kluczowe

EN

heat pipe; porous media; non-Darcian

PL

materiałoznawstwo

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: Applied Mechanics and Engineering
• Rocznik: 1998
• Tom: Vol. 3, no 3
• Strony: 433--450
• Opis fizyczny: Bibliogr. 8 poz., wykr.

Twórcy

autor

Ozguc A. F.

• Istanbul Teknik Üniversitesi, Makina Fakültesi 80191-Gümüşsuyu, Istanbul, TURKEY