modes of heat transfer other than conduction

... 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

... 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 ... specific heat c of the solid are all constant. The principle of conservation of energy for the control volume, surface area A, and thickness of Fig. 2.2 can be stated as follows: rate of heat conduction...

Ngày tải lên: 08/04/2014, 11:00

... 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, ... with 160,000 atoms. Heat conduction by the electron gas, which dominated heat transfer in metal, could not be predicted by the Morse potential function. Alternatively, heat conduction was simulated...

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... 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, ... 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 ... 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

... 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 ... 1 Heat and Temperature 1 Heat and Work 2 Modes of Transferring Heat 2 Heat Flux 3 Thermal Conductivity 3 Log Mean Temperature Difference 3 Convective Heat Transfer Coefficient 4 Overall Heat Transfer ... temperature, and heat transfer will cease. Energy has not been lost, but instead some energy has been transferred from one block to another. Modes of Transferring Heat Heat is always transferred when...

Ngày tải lên: 17/03/2014, 15:00

... 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 ... the pull of gravity on a body. The specific volume of a substance is the volume per unit mass of the substance. Typical units are ft 3 /lbm. Density, on the other hand, is the mass of a substance...

Ngày tải lên: 17/03/2014, 15:00

... chemistry: new aspects of thiamin metabolism, especially triphosphate derivatives acting other than as cofactors Lucien Bettendorff and Pierre Wins GIGA-Neurosciences, University of Lie ` ge, Belgium Thiamin ... mentioned above, incubation of E. coli in amino acid-deficient medium in the presence of a suitable car- bon source led to the accumulation of ThTP. How- ever, in the absence of a carbon source, no ... dogma, with practically complete ignorance of other thiamin derivatives and the enzymes of thiamin metabolism (Fig. 1). In E. coli, a significant part of ThDP (up to 60%) can be rapidly converted...

Ngày tải lên: 29/03/2014, 23:20

... 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 ... other bodies, such as corrugated surfaces or bodies of relatively complicated shapes. It is readily recognised that a wealth of information is now available on con- vective heat and mass transfer ... 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

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Ngày tải lên: 02/04/2014, 15:24

... radiative heat flux and the heat flux by conduction across a gap distance of L ϭ 0.2 mm. Also deter- mine the value of (dT w /dt) i , resulting from each of the heating modes. (b) For gap distances of ... 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 ... depen- dence of the convection heat transfer coefficient h is generally weak. The surfaces of Figure 1.6 may also simultaneously transfer heat by convection to an adjoining gas. For the conditions of Figure...

Ngày tải lên: 02/04/2014, 15:51

... thermal conductivity of a solid is larger than that of a liquid, which is larger than that of a gas. As illustrated in Figure 2.4, the thermal conductivity of a solid may be more than four orders of magnitude ... 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

... 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 ... 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 ... 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...

Ngày tải lên: 02/04/2014, 15:52

... 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