PPT-Heat and mass transfer Prepared by : Prof .Dr / Hesham Mostafa

Eng Abdelrhman Essam Free convection and Radiation Convection Convection Heat transfer can be classified into 1 forced convection 2 free convection Introduction to free convection. As we recall we spent on laminar flows in external boundary layers and ducted flows in the first 20 lectures hen we spent 10 lectures on how to tackle turbulent flows and heat transfer Refer Slide Time 0100 ow we have turned to convective mass trans Analogies. Heat .  Mass  . (sometimes). Momentum. Analogies are useful tools. An aid to understand transfer phenomena. A sound means . t. o predict behavior of systems for which limited quantitative data are available. Kostic. ’s. . Research . &. Scholarly Interests and Activities. Fundamentals . and . Application . of . Energy. www.kostic.niu.edu. The . Fundamental Laws of . Nature:. The Laws of Thermodynamics. 4.1 …………. Introduction and Types of Fins. 4.2 …………. Governing Equation of Fin. 4.3 …………. Heat Dissipation through Rectangular Fin. 4.4 …………. Heat Dissipation from Infinitely Long Fin. Heat Transfer. Energy transfer from a . HOTTER. object to a . COOLER. one. Heat Transfer. Energy transfer from a . HOTTER. object to a . COOLER. one. How is heat transferred? (3 Ways). Heat Transfer. Heat Transfer . is the transport of . thermal energy. due to a temperature difference across a . medium(s. ). mediums: gas, liquid, solid, liquid-gas, solid-gas, solid-liquid, solid-solid, etc.. Thermal Energy. Summary of Equations of Change.  . Summary of Equations of Change. Summary of Equations of Change.  . The momentum molecular flux, .  . * .  . molecular . stresses = pressure + viscous stresses. Summary of Equations of Change. Introduction. 1,2. : . There . is a continuing need to design better . cooling . devices for electronics components because of increasing power and also . miniaturized . sizes. Heat pipes have been proven to be among the most efficient passive cooling solutions for . Dhameliya. . Paras. (13me024). Submitted to... Prof. M.K.Pujara. Department Of Mechanical Engineering. B.H.Gardi. College Of Engineering & Technology, Rajkot.. . HEAT TRANSFER. Heat Conduction Through. LO3.1: Lesson . 1. : . . Type of Heat Exchangers (. Recuperators. ). Aim. LO3: To be able to Evaluate Heat Transfer Equipment.. Learning Outcomes. At the end of this session the students will be able to…. Jamie Sigmon. Suresh Nulu. ISPE . CaSA. Technology Conference . ·. . March 13, 2018. Intro to lyophilization. Paradigm shift: current state vs. new state. Mathematical basis for process modeling. Mallare. , Tristan Howell C.. 5ChEC. Humidification. Evaporative humidification has effect when . a liquid is in direct contact with a gas. . The liquid evaporates into the gas because of the vapor concentration difference that exists between the liquid and the gas at the interface. Thus, the . Nimesh Gajjar. CONVECTIVE HEAT TRANSFER. . Convection heat transfer involves . fluid motion . heat conduction. The fluid motion enhances the heat transfer, since it brings hotter and cooler chunks of fluid into contact, initiating higher rates of conduction at a greater number of sites in fluid. Therefore, the rate of heat transfer through a fluid is much higher by convection than it is by conduction. In fact, the higher the fluid velocity, the higher the rate of heat transfer.. EE 471. Basics. High-frequency (HF) surgery can be defined as application of electrical energy in surgery for effecting thermally induced change or destruction of tissue cells with aim of hemostasis (stopping bleeding), cutting tissue, or sealing it.