example of heat transfer through conduction

... Nusselt number (heat transfer coefficient) as a function of roughness and flow parameters in the form of repeated ribs. In order to understand the mechanism of heat transfer through a roughened ... 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...

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 ... direction of the heat flow. The actual rate of heat flow depends on the thermal conductivity k, which is a physical property of the medium. For conduction through a homogeneous medium, the rate of heat ... 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

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Ngày tải lên: 05/09/2013, 15:28

... of this paper is to present the evaluation of condensation and refrigeration heat transfer performances of two types of mirofin tubes namely Tube A and Tube B. International Journal of ... Calculation of turbulent flow and heat transfer in a porous- based channel. Int. J Heat Mass Transfer, 46:771-780. [26] Park, I.S. and Choi, D.H. 2001. Heat and mass -transfer analysis of the condensing ... Honda, H. 2000. Condensation of refrigerants in horizontal, spirally grooved microfin tubes: Numerical analysis of heat transfer in the annular flow regime. J Heat Transfer, 122:80-91. [5] Cavallini,...

Ngày tải lên: 05/09/2013, 16:10

... assessment of the relative importance of conformational change rates versus rates of FMNH 2 formation in limiting elec- tron flux through the CaM-bound NOS enzymes. In general, as the k on and k off of ... fast rates of FMNH 2 formation, electron flux through the flavoprotein is primarily a function of the rates of con- formational change (k 1 , k 2 ) that determine K eq A. How- ever, when the rate of conformational ... a useful predictor (but never proof) of changes in equilib- rium A in dual-flavin enzymes. Figure 6 contains curves showing how electron flux through the FMN subdo- main of a dual-flavin enzyme, as measured...

Ngày tải lên: 18/02/2014, 11:20

... electron- transfer mechanism, EPR data indicate that the binding of nitrite to the T2Cu center increases its potential, favoring the electron -transfer process. Analysis of the EPR spectrum of the ... 1.7.2.1). *Present address: Institute of Pharmacology and Therapeutics, Faculty of Medicine of Porto, and Institute for Molecular and Cell Biology, University of Porto, Alameda Prof. Hernaˆ ni Monteiro, 4200–319 ... (1976) Assays of proteins in the presence of interfering materials. Anal. Biochem. 70, 241–250. 21. Laemmli, U. K. (1970) Cleavage of structural proteins during the assembly of the head of bacteriophage...

Ngày tải lên: 07/03/2014, 15:20

... 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

... 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 ... portions of a fluid. Radiation, or radiant heat transfer, involves the transfer of heat by electromagnetic radiation that arises due to the temperature of a body. Heat flux is the rate of heat transfer ... represents a measure of the ability to transfer heat through a stagnant film layer. The overall heat transfer coefficient is the measure of the ability of a heat exchanger to transfer heat from one...

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 ... Av ã 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

... 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

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Ngày tải lên: 02/04/2014, 15:24

... 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 ... the wall is by conduction, the heat flux may be determined from Fourier’s law. Using Equation 1.2, we have The heat flux represents the rate of heat transfer through a section of unit area, and ... 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...

Ngày tải lên: 02/04/2014, 15:51

... What is the heat flux through a 2 m ϫ 2 m sheet of the insulation? (b) What is the rate of heat transfer through the sheet of insulation? 1.2 The heat flux that is applied to the left face of a plane wall ... 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, ... 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...

Ngày tải lên: 02/04/2014, 15:51

... 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 ... 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