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Hydrodynamic and thermal analysis of Fluidyne heat engine

Arslanturk C., Ozguc A. F.

Applied Mechanics and Engineering

2000

Vol. 5, no 2

435-449

Fluidyne is an easy-to-build and quiet heat engine using low-grade heat sources and not having any moving solid parts. Although Fluidyne?s efficiency is quite low compared with efficiencies of other heat engines, it has an important advantage of using recovered heat. In this study, a mathematical model that analyses Fluidyne is developed. The model utilizes the equations of conservation of mass written for liquid columns and working fluid. Sets of differential equations are solved using Runge-Kutta Method. In order to investigate the validation of the model, theoretical results are compared with experimental results and the results in literature.

Non-darcian effects on the heat-pipe wicking limit

Ozguc A. F.

Applied Mechanics and Engineering

1998

Vol. 3, no 3

433-450

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.