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所在平台: Udemy |
课程主页: https://www.udemy.com/course/heat-transfer/
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课程名称：热传递 - 工程方法 课程概述：在热工程领域，热传递涉及热能或热量在物理系统之间的产生、利用、转化和交换。热传递过程包括热传导、热对流、热辐射和通过相变的能量传输等不同机制。工程师在实现热传递时还需考虑不同化学物质之间的质量传递（通过对流的质量传递），无论是冷的或热的。尽管这些机制有各自的特征，但它们通常在同一系统中同时发生。 课程内容包括： 1. 热传递简介 - 热传递模式 - governing The Laws of Heat Transfer Modes 2. 传导 - 在笛卡尔、柱面和球坐标系中的一般热传导方程 - 一维稳态热传导 - 鳍片 - 瞬态热传导 3. 对流 - 尺寸分析 - 边界层概念 - 自然对流与强制对流 4. 辐射 - 辐射定律 - 形状因子 - 辐射屏蔽 - 辐射网络的电气模拟 5. 热交换器 - 热交换器类型 - LMTD分析 - NTU分析 6. 沸腾与冷凝 - 沸腾阶段 - 薄膜与滴状冷凝 通过参加本课程，学生将对热传递有更深的概念理解，并且能够接触到更广泛的问题。
Within the field of thermal engineering, heat transfer addresses the creation, utilization, transformation, and interchange of thermal energy, or heat, amongst physical systems. Different mechanisms, including thermal conduction, thermal convection, thermal radiation, and energy transmission via phase changes, are categorized as heat transfer processes. To accomplish heat transfer, engineers also take into account the transfer of mass between different chemical species (mass transfer via advection), which can be either cold or hot. Despite having different features, these mechanisms frequently happen at the same time in the same system.The direct microscopic exchange of kinetic energy of particles (like molecules) or quasiparticles (like lattice waves) across the border between two systems is known as heat conduction, also known as diffusion. When a thing is not at the same temperature as another body or its surroundings, heat moves in the opposite direction until the body and its surroundings establish thermal equilibrium. The second rule of thermodynamics states that such spontaneous heat transfer always takes place from one area of high temperature to another area of lower temperature. When a fluid (gas or liquid) moves in bulk, heat convection happens because the fluid is carrying heat through it. Every convective process transfers heat in part through diffusion as well. Fluid flow can be compelled by external factors or, in the case of gravitational fields, by buoyant forces resulting from the expansion of fluid due to thermal energy, as in the case of a fire plume, which affects the fluid's own transmission. "Natural convection" is a common term for the latter process. A common term for the former approach is "forced convection." In this instance, a pump, fan, or other mechanical device is used to compel the fluid to flow. Thermal radiation occurs through a vacuum or any transparent medium (solid or fluid or gas). It is the transfer of energy by means of photons or electromagnetic waves governed by the same lawsIn this course student will be able to learn1. Introduction to Heat Transfer - Modes of Heat Transfer - Laws governing Modes of Heat Transfer2. Conduction - General Heat Conduction Equation in Cartesian, Cylindrical and Spherical Co-ordinates - One dimensional steady state heat conduction - Fins - Transient Heat Conduction3. Convection - Dimensional Analysis - Boundary Layer Concepts - Natural or Free Convection - Forced Convection4. Radiation - Laws of Radiation - Shape Factor - Radiation Shields - Electrical Analogy for Radiation Networks5. Heat Exchangers - Types of Heat Exchangers - LMTD Analysis - NTU Analysis6. Boiling and Condensation - Boiling Regimes - Film and Drop wise condensationAfter enrolling to the course students will have a better conceptual understanding and also they get greater exposure to wide range of problems.
