Three-Dimensional Linear Instability Analysis of Thermocapillary Return Flow on a Porous Plane

A three-dimensional linear instability analysis of thermocapillary convection in a fluid-porous double layer system, imposed by a horizontal temperature gradient, is performed. The basic motion of fluid is the surface-tension-driven return flow, and the movement of fluid in the porous layer is governed by Darcy＇s law. The slippery effect of velocity at the fluid-porous interface has been taken into account, and the influence of this velocity slippage on the instability characteristic of the system is emphasized. The new behavior of the thermocapillary convection instability has been found and discussed through the figures of the spectrum.     

智能频率计的硬件和软件

本文介绍的智能频率计是一种带微机的多功能的通用电子计数器,文中详述了智能频率计的系统硬件和软件,为研制性能价格比高的时间和频率测量仪器提供了一种系统的设计方法.     

Thermocapillary Convection in an Inhomogeneous Porous Layer

A new model consisting of an inhomogeneous porous medium saturated by incompressible fluid is investigated. We focus on the effects of inhomogeneity for the streamline patterns and instabilities of the system. Influences of the ＇mean porosity＇ and gradient of distributions of porosity are also emphasized. The results cannot be obtained by studying the media with constant porosity as carried out by other researchers, and have not been discussed before.     

微机在移动罩滤池控制中的应用

本文在比较继电器控制、电子器件控制及微机控制移动罩滤池工作特点的基础上,分析了移动罩微机控制系统的工作原理与特点,且对系统硬件接口电路和软件系统与流程图作了较全面的讨论.