Analysis on Gravitational Effect o Nonlinear Diffusion System of Vapor Molecules in A Heat Pipe
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概要
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A nonlinear diffusion equation with a diffusion coefficient depending on number density of diffusing particles affected by gravity is approximately solved in a steady state. Characteristic properties of vapor molecules in a heat pipe are analyzed as diffusion process of Brownian particles. In order to explain the nonlinear shifts from a linear diffusion system in conventional theories, the expectation values and the variance of number density of vapor molecules are calculated by using the theory of stochastic processes. As a result, a diffusion thermal resistance of a heat flow in a heat pipe is estimated by taking an average value of the diffusion coefficient in a nonlinear diffusion system.
- 宇宙航空研究開発機構の論文
- 1986-03-00
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