HEAT TRANSFER LECTURE 1 OUTLINE Introduction Heat Conduction Forced Convection Natural Convection Application of Conduction & Convection Thermal Radiation Application of Radiation Introduction What does the subject of heat transfer deal with? And why it is important. What does the subject of mass transfer deal with? Heat transfer is the science that deals with the study of rates of exchange of heat between hot and cold bodies.
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DEFINITION OF HEAT TRANSFER | Heat transfer is energy in transit due to temperature difference . Whenever there exists a temperature difference in a medium or between media‚ heat transfer must occur. The basic requirement for heat transfer is the presence of temperature difference . There can be no net heat transfer between two mediums that are at the same temperature. The temperature difference is the driving force for heat transfer‚ just as the voltage difference is the driving force for electric
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enters the drum. Convection superheater The steam produced in the boiler is nearly saturated. This steam as such should not be used in the steam turbine. The presence of moisture in it will cause corrosion of turbine blades‚ etc. to raise the temperature of steam and thereby to increase the turbine efficiency‚ superheater is used. The principle of convection superheater is similar to steam generating tubes of the boiler. The hot flue gases at high temperature sweep over convection superheated tubes
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Numerical Simulation of Marangoni-Driven Boundary Layer Flow Over a Flat Plate with an Imposed Temperature Distribution Abstract: A numerical algorithm is presented for studying Marangoni convection flow over a flat plate with an imposed temperature distribution. Plate temperature varies with x in the following prescribed manner: where A and k are constants. By means of similarity transformation‚ the original nonlinear partial differential equations of flow are transformed to a pair of nonlinear
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Heat Conduction along a Composite Bar Objective To study the conduction of heat along a composite bar and evaluate the overall heat transfer coefficient. Theory Thermal conduction is the mode of heat transfer which occurs in a material by virtue of a temperature gradient within it. A solid is chosen for the demonstration of pure conduction since both liquids and gasses exhibit excessive convective heat transfer. In a practical situation‚ heat conduction occurs in three detentions‚ a complexity
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Some Solutions to Problems (Übungen) to Lecture-1 of Lecture Series “Heat Transfer – 1” Institut für Energieverfahrenstechnik und Brennstofftechnik‚ TU Clausthal‚ SS 2005 1.1 A heat rate of 5 kW is conducted through a cross section area of 20 m2 and thickness of 3 cm. If the inner (hot) surface temperature is 600ºC and the thermal conductivity of the material is 0.5 W/mK‚ what is the outer surface temperature? Solution: Tout = 585 °C 1.2 The heat flux through a wood slab 50 mm thick‚ whose inner
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time 300‚ and 600 seconds were used to find the slope and equation of the graph. The graph had a negative slope and the equation of the line was y= -0.0028x - 0.8692. Theory The theory behind this experiment is to investigate the natural convection from a sphere‚ using lumped system analysis. A lumped system analysis is used to determine the convective heat transfer of lumped objects‚ having negligible internal resistance as compared to the external flow resistance‚ the temperature is assumed
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Flat-Plate Solar Collectors The Absorption of Solar Radiation A flat-plate solar collector usually has a non-selective or a selective black plate with one or two glass covers a few centimeters above the black plate‚ and a well insulated back. The length of the plate is typically about 2m. Edge effects are usually small. The transmittance () of a glass cover for solar radiation depends on the angle of incidence . Typical values for clear glass are given in Table 1. Table 1. Transmittance of a Glass
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1.0 Introduction 1.1 Aim and Assumptions: The aim of this experiment is to observe the rate of diffusion of diethyl ether vapour into stagnant air‚ and then determine the diffusivity. An error analysis of this calculation also had to be carried out. The following assumptions made were: * Diethyl Ether is an ideal gas * Partial pressure at the top of the tube was equal to zero * Mass transfer resistance between the liquid surface at the bottom of the tube is insufficient‚ compared with the
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MAE 441 Design of a Finned Radiator Assembly Heat Exchanger Design Project Thien Van Tran Chris Longfield Eric Pacewicz Olivia Ching 4/3/2012 Scope of the Project The objective of the project was to design an effective radiator assembly to accommodate the Diesel-Engine Generator Set 1500-XC6DT2 by incorporating the use of tubes with inner fins in various geometries in order to meet the heat rejection requirements specified. This was done with consideration for minimizing cost
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