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所在平台: Udemy |
课程主页: https://www.udemy.com/course/heat-transfer-a-mathermatical-approach/
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**课程名称：** 热传递 (Heat Transfer) **课程概述：** 本课程深入探讨热能（热量）在物理系统中的产生、利用、转化和交换，这是热工程学领域的核心内容。课程将详细介绍热传递的各种主要方式，包括热传导、热对流、热辐射以及相变过程中的能量传递。此外，课程还将涵盖工程师在热传递过程中考虑物质（无论冷热）的对流以及其中包含的不同化学物质的传递。虽然这些过程各自独立，但在实际系统中常常同时发生。 **关键概念：** * **热传导 (Heat Conduction)：** 微观层面，通过粒子（如分子）或准粒子（如晶格振动）在系统边界处的动能交换来传递热量。当物体与周围环境存在温差时，热量会自发地从高温区域流向低温区域，直至达到热平衡，这符合热力学第二定律。 * **热对流 (Heat Convection)：** 当流体（气体或液体）整体流动时，其携带热量进行传递。所有对流过程都伴有部分热传导。流体的运动可以是外部力驱动（强制对流），也可以是由于受热膨胀在重力场中产生的浮力驱动（自然对流），例如火苗的上升。 * **热辐射 (Thermal Radiation)：** 通过真空或任意透明介质（固体、液体或气体）以光子或电磁波形式传递能量，遵循相同的物理定律。 **课程内容：** 本课程包含对各种热传递模式的重要推导和相关定律。课程共分为八个章节，涵盖： 1. 引言 (Introduction) 2. 传导 (Conduction) 3. 散热片或扩展表面 (Fins or Extended Surfaces) 4. 瞬态热传导 (Transient Heat Conduction) 5. 量纲分析 (Dimensional Analysis) 6. 对流 (Convection) 7. 辐射 (Radiation) 8. 换热器 (Heat Exchangers) 课程还将讨论一些重要的工程问题。 **目标受众：** 本课程对准备 **GATE/ESE 和 PSU (Public Sector Undertakings)** 考试的考生非常有帮助。
The generation, utilization, conversion, and exchange of thermal energy (heat) across physical systems is the subject of the thermal engineering field known as heat transfer. Different heat transmission techniques, including thermal conduction, thermal convection, thermal radiation, and energy transfer by phase changes, are categorized. To achieve heat transmission, engineers also take into account the advection of material containing various chemical species, whether hot or cold. Despite the fact that each of these processes has unique properties, they frequently coexist in the same system.Heat conduction, also known as diffusion, is the microscopic exchange of kinetic energy via the border of two systems between particles (like molecules) or quasiparticles (like lattice waves). When a body or its surroundings are at a temperature that is different from an object, heat flows between them until they both reach the same temperature, at which point they are in thermal equilibrium. According to the second rule of thermodynamics, such spontaneous heat transfer always takes place from one area with a high temperature to another with a lower temperature.When a fluid (gas or liquid) flows in its bulk, its heat is carried through the fluid. This is known as heat convection. Heat is also moved in part through diffusion in all convective processes. The movement of a fluid may be influenced by external forces or, less frequently (in gravitational fields), buoyant forces brought on by the expansion of the fluid due to heat energy (such as in a fire plume). The latter is frequently referred to as "natural convection." The former method is frequently referred to as "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 laws.This course contains important derivations, laws related to various modes of Heat transfer. A total of 8 chapters will be discussed which are as follows 1. Introduction2. Conduction3. Fins or Extended Surfaces4. Transient Heat Conduction5. Dimensional Analysis6. Convection7. Radiation8. Heat ExchangersSome important problems will also be discussed. This course will be helpful for the aspirants of GATE/ESE and PSU's
