example problem of heat transfer
An experimental investigation of heat transfer and fluid flow in a rectangular duct with inclined discrete ribs
... value of turbulent intensity is observed at the relative gap width of 1.0 which is in the line of heat transfer measurements. These results of PIV showed good agreement between the heat transfer ... Investigation of heat transfer and friction for rib- roughened surfaces, Int. Journal of Heat & Mass Transfer 1978; 21: 1143-1156. [4] Webb R.L., Eckert E.R.G. and Goldstein R. J. Heat transfer ... Journal of Heat and Mass Transfer1 999; 42: 1597-1615. [16] Karwa R, Experimental studies of augmented heat transfer and friction in asymmetrically heated rectangular ducts with ribs on the heated...
Ngày tải lên: 05/09/2013, 16:10
Ptinciples of heat transfer
... A, and thickness of Fig. 2.2 can be stated as follows: rate of heat conduction rate of heat conduction into control volume out of control volume +=+ (2.1) rate of heat generation rate of energy storage ... Basic Modes of Heat Transfer 2 1.1 The Relation of Heat Transfer to Thermodynamics 3 1.2 Dimensions and Units 7 1.3 Heat Conduction 9 1.4 Convection 17 1.5 Radiation 21 1.6 Combined Heat Transfer ... Combined Heat Transfer Systems In the preceding sections the three basic mechanisms of heat transfer have been treated separately. In practice, however, heat is usually transferred by several of the basic...
Ngày tải lên: 08/04/2014, 11:00
Experimental and numerical investigation of heat transferand phase change phenomena during excimer laser interactionwith nickel
... "m −0 K −0 #Ł L lv latent heat of evaporation ðJ kg −0 Ł L sl latent heat of fusion ðJ kg −0 Ł M molar weight ðkg kmol −0 Ł n ¼ complex index of refraction n\ k real and imaginary part of the complex index of refraction p ... instead of a Gaussian distribution commonly seen for other types of laser[ The size of the laser spot on the target surface is several millimeters\ while the heat di}usion depth is of the order of ... X[ Xu\ K[H[ Song\ Measurement of radiative properties of pulsed laser induced plasma\ J[ Heat Transfer 008 "0886# 491Ð497[ ð7Ł K[H[ Song\ X[ Xu\ Mechanisms of absorption in pulsed excimer...
Ngày tải lên: 06/05/2014, 08:55
molecular dynamics simulation of heat transfer and phase change during
... surface of the target by scaling velocities of atoms in cells on the top surface, and the same amount of heat flux is dissipated from the bottom of the target by scaling velocities of atoms ... Study of Light-to -heat Absorption Mechanism in atomic Systems," International Journal of Heat and Mass Transfer, 41, pp. 839-849. 3. Häkkinen, H., and Landman, U., 1993, "Superheating, ... the distribution of number density of atoms in space at different times, which demonstrates the variation of solid structure during laser heating. At the early stage of laser heating, the crystal...
Ngày tải lên: 06/05/2014, 08:55
molecular dynamics simulation of heat transfer and phase change during
Ngày tải lên: 06/05/2014, 08:57
molecular dynamics simulation of heat transfer and phase change during
Ngày tải lên: 06/05/2014, 08:59
MÔ HìNH HOá QUá TRìNH TRAO ĐổI NHIệT ẩM TRONG MáY ấP TRứNG GIA CầM Modeling of heat and mass transfer in chicken egg incubators
Ngày tải lên: 28/08/2013, 08:31
Effect of periodic suction on three dimensional flow and heat transfer past a vertical porous plate embedded in a porous medium
Ngày tải lên: 05/09/2013, 14:58
Cooling load optimization of an irreversible refrigerator with combined heat transfer
Ngày tải lên: 05/09/2013, 15:28
Ecological performance of a generalized irreversible Carnot heat engine with complex heat transfer law
Ngày tải lên: 05/09/2013, 15:28
doe fundamentals handbook - thermodynamics, heat transfer, and fluid flow - volume 1 of 3
... types of latent heat. The first is the latent heat of fusion. This is the amount of heat added or removed to change phase between solid and liquid. The second type of latent heat is the latent heat ... ENERGY, WORK, AND HEAT Another type of heat is called latent heat. Latent heat is the amount of heat added to or removed from a substance to produce a change in phase. When latent heat is added, ... latent heat of vaporization. This is the amount of heat added or removed to change phase between liquid and vapor. The latent heat of vaporization is sometimes called the latent heat of condensation. Different...
Ngày tải lên: 17/03/2014, 15:00
doe fundamentals handbook - thermodynamics, heat transfer, and fluid flow - volume 2 of 3
... modes of heat transfer: Conduction involves the transfer of heat by the interactions of atoms or molecules of a material through which the heat is being transferred. Convection involves the transfer ... heat transfer coefficient must be used to solve problems. • The heat transfer equation for convection heat transfer is . ˙ Q hA∆T Rev. 0 Page 25 HT-02 Heat Transfer HEAT TRANSFER TERMINOLOGY Heat ... HT-02 Heat Transfer Intentionally Left Blank HT-02 Page x Rev. 0 Heat Transfer TABLE OF CONTENTS TABLE OF CONTENTS LIST OF FIGURES iii LIST OF TABLES iv REFERENCES v OBJECTIVES vii HEAT TRANSFER...
Ngày tải lên: 17/03/2014, 15:00
doe fundamentals handbook - thermodynamics, heat transfer, and fluid flow - volume 3 of 3
... feet, of a column of water that a given pressure will support. Each of the energies possessed by a fluid can be expressed in terms of head. The elevation head represents the potential energy of ... represents the flow energy of a column of fluid whose weight is equivalent to the pressure of the fluid. The sum of the elevation head, velocity head, and pressure head of a fluid is called the ... Av • The principle of conservation of mass states that all mass flow rates into a control volume are equal to all mass flow rates out of the control volume plus the rate of change of mass within...
Ngày tải lên: 17/03/2014, 15:00
convective heat transfer mathematical and computational modelling of viscous fluids and porous media
... boundary conditions of practi- cal interest. The number of excellent review articles, books and monographs, which summarise the state -of- the-art of convective heat and mass transfer, which are ... features of the flow and heat transfer characteristics, as for example, boundary-layer separation and flow circulation. As a result, these characteristics depend on the development of the vis- ... delaying the onset of the separation of the boundary-layer from the plate, as can be seen from Figure 2.15, where the plot of the location of the separation point, Xs, as a function of Pr (xs is...
Ngày tải lên: 01/04/2014, 10:51
fundamentals of heat and mas transfer seventh edition
... Analysis of Heat Transfer Problems: Methodology A major objective of this text is to prepare you to solve engineering problems that involve heat transfer processes. To this end, numerous problems ... function of current for the range 100 Յ I Յ 5000 A. Also plot the ratio of the heat transfer by convection to the total heat transfer. 1.62 A small sphere of reference-grade iron with a specific heat ... surface of the wall. The heat loss through the wall of area is then ᭠ Comments: Note the direction of heat flow and the distinction between heat flux and heat rate. *This icon identifies examples...
Ngày tải lên: 02/04/2014, 15:51
fundamentals of heat and mass transfer
... significant problems of contemporary interest. EXAMPLE 1.8 In a large steam power plant, the combustion of coal provides a heat rate of q in ϭ 2500 MW at a flame temperature of T h ϭ 1000 K. Heat is ... description of the heat transfer between a heat engine and its surroundings further limits the actual efficiency of a heat engine. 1.3.1 Relationship to the First Law of Thermodynamics (Conservation of ... heater dissipates 2 kW while submerged in a water flow that is at 20ЊC and provides a convection heat transfer coefficient of h ϭ 5000 W/m 2 ⅐ K. Neglecting heat transfer from the ends of the heater,...
Ngày tải lên: 02/04/2014, 15:51
incropera fundamentals of heat and mass transfer
... tot q/q ′′ vs. T, note that the convection heat transfer rate is always a small fraction of the total heat transfer. That is, radiation is the dominant mode of heat transfer. Note also that the convection ... generally small, concurrent heat transfer by radiation and/or conduction must often be considered. However, jet impingement is one of the more effective means of transferring heat by convection and ... Electrical heater is perfectly insulated from dryer wall, (3) Heater and switch are isothermal at T set , (4) Negligible heat transfer from sides of heater or switch, (5) Switch surface, A s , loses heat...
Ngày tải lên: 02/04/2014, 15:52
mass and heat transfer analysis of mass contactors and heat exchangers (cambridge series in chemical engineering)
... 11:4 Mass and Heat Transfer ANALYSIS OF MASS CONTACTORS AND HEAT EXCHANGERS T. W. FRASER RUSSELL University of Delaware ANNE SKAJA ROBINSON University of Delaware NORMAN J. WAGNER University of Delaware v P1: ... 521 88670 3 December 21, 2007 23:45 68 Heat Exchanger Analysis Batch and semibatch heat exchangers are used when the heating or cooling of a fixed volume of fluid is required, whereas continuous ... entity. Each of these types of exchangers is discussed next. 3.3.1 Batch Heat Exchanger The batch heat exchanger system was discussed extensively in Subsection 3.2.3 with the development of methods...
Ngày tải lên: 02/04/2014, 15:52
Fundementals of heat and mass transfer kotandaraman
... COMBINED MODES OF HEAT TRANSFER Previous sections treated each mode of heat transfer separately. But in practice all the three modes of heat transfer can occur simultaneously. Additionally heat generation ... 190°C 5 4 3 2 Fig. P. 2.23. (a) Problem model. VED c-4\n-demo\demo1-1.pm5 12 FUNDAMENTALS OF HEAT AND MASS TRANSFER Solution: Refer equation 1.10 Heat convected + heat radiated = heat conducted considering ... 1m 3 heat generation is 36000 W/m 3 This problem illustrates the use of the temperature gradient in the determination of heat flow. The general one dimensional heat flow equation with heat generation...
Ngày tải lên: 08/04/2014, 10:55