conceptual question of heat transfer

... ASME Proceedings of NHTC'01 35th National Heat Transfer Conference Anaheim, California, June 10-12, 2001 NHTC2001-20070 MOLECULAR DYNAMICS SIMULATION OF HEAT TRANSFER AND PHASE ... 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 ... 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, 08:57

... ASME Proceedings of NHTC'01 35th National Heat Transfer Conference Anaheim, California, June 10-12, 2001 NHTC2001-20070 MOLECULAR DYNAMICS SIMULATION OF HEAT TRANSFER AND PHASE ... 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 ... 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, 08:59

... with correlations of Rohsenow [2] and Imura [3]. Figure shows the experimental data of Noie [10] for heat transfer coefficient of evaporator. Figure 5. Heat transfer coefficient of evaporator versus ... entrainment limit. 2. Models of equations The rate of heat transfer to the evaporator section of a thermosyphon can be calculated from the Eq. (1) (1) Q in = V / R = RI The rate of heat remove from the ... thermosyphons are very efficient heat transfer devices, they are subject to a number of heat transfer limitations. These limitations determine the maximum heat transfer rate that a thermosyphon

Ngày tải lên: 09/09/2015, 10:32

... LC are the rates of heat-transfer supplied by the heat source and released to the heat sink by the working fluid, respectively; Q H and Q L are the real rates of heat-supply and heat-release, respectively. ... Carnot heat engine of the same heat input, the generalized irreversible Carnot engine can deliver less power and release more heat to the heat sink. Hence, the rate of heat flow ( QLC ) to the heat ... irreversible Carnot heat engine cycle model Assuming the rates of the heat flow in the heat-exchangers follow the generalized radiative heat transfer law, q ∝ ∆(T n ) , where n is a heat transfer exponent,

Ngày tải lên: 09/09/2015, 10:32

... of particle diameter on heat transfer for L/W=5 142 Figure 8.13: Effect of particle diameter on heat transfer for L/W=7 142 Figure 8.14: Effect of particle materials on heat transfer ... of inlet Reynolds number on heat transfer 145 Figure 8.16: Effect of gravity direction on heat transfer 146 xv LIST OF TABLES Table 1.1: Summery of parameters studied in... of ... Effects of wall factors 8.2.3.1 Effect of wall material 8.2.3.2 Effect of reflection coefficient on heat transfer 8.2.3.3 Effect of impingement wall temperature 8.2.4 Effect of particle factors on heat

Ngày tải lên: 17/09/2015, 17:19

... air heater Increasing the area of the absorber plate shape will increase the heat transferred to the following air The efficiency of a solar collector is the ratio of the amount of useful heat ... direction of thickness panel (m) temperature inlet (°C) outlet fluid temperature (°C) wind velocity (m/s) convection heat transfer coefficient (W/m2 K) specific heat of air (J/kg K) area of absorber ... Journal of Advanced Research (2014) 5, 183–192 Cairo University Journal of Advanced Research ORIGINAL ARTICLE Experimental study of heat transfer and thermal performance with longitudinal fins of solar

Ngày tải lên: 13/01/2020, 11:50

... wind Describe the modes of heat transfer determining heat loss from the person’s body GIVEN • Person standing in a cold wind, wearing a heavy parka FIND (a) The modes of heat transfer SKETCH Rshirt ... https://TestbankDirect.eu/ Solution Manual for Principles of Heat Transfer 7th Edition by Kreith Full file at https://TestbankDirect.eu/ • • Heat of vaporization of LOX (hfg) = 213 kJ/kg Maximum evaporation ... https://TestbankDirect.eu/ Solution Manual for Principles of Heat Transfer 7th Edition by Kreith Full file at https://TestbankDirect.eu/ FIND • The rate of heat transfer in watts per square meter ASSUMPTIONS

Ngày tải lên: 21/08/2020, 09:48

... surface temperature of the sphere A calculation of the total rate of heat transfer to the sphere would have to take the rate on condensation and the rate of radiative heat transfer into account ... resistances of a unit area for convection between a surface and various fluids GIVEN  Table 1.4— The order of magnitude of convective heat transfer coefficient ( hc ) FIND  The order of magnitudes of ... SOLUTION Equilibrium and the conservation of energy require that the heat gain of the probe by radiation if equal to the heat lost by convection The rate of heat transfer by convection is given by Equation

Ngày tải lên: 21/08/2020, 13:29

... the influence of noise in measured temperature data, improving the stability of inverse heat transfer analysis Consequently, the benefit of the employment of POD in inverse heat transfer problems ... analysis and optimization of fins under sensible and latent heat load International Journal of Heat and Mass Transfer, 124, (2018), pp 331–343 https://doi.org/10.1016/j.ijheatmasstransfer.2018.03.059 ... value of ε, e.g ε = 10−8 , the l number of POD basis vectors can be selected Estimation of heat transfer parameters by using trained POD-RBF and Grey Wolf Optimizer 407 3.4 Approximation of the

Ngày tải lên: 28/06/2021, 11:18

... and the rate of heat transfer are discussed with the help of figures and tables Copyright © 2010 International Energy and Environment Foundation - All rights reserved Keywords: Heat transfer, Periodic ... convective flow and heat transfer through a porous medium with periodic permeability Chauhan and Sahal [13] analyzed the flow and heat transfer over a naturally permeable bed of very small permeability ... temperature of the flow field are solved employing perturbation technique and the effects of the pertinent parameters on the velocity, temperature, skin friction and the rate of heat transfer are

Ngày tải lên: 05/09/2013, 14:58

... optimal expansion of a heated working fluid with convective radiative heat transfer [7] and to investigate the effects of variable specific heat ratio of working fluid on the performance of an irreversible ... Fine-time exergoeconomic performance of a Newtonian heat transfer law system generalized irreversible combined heat pump with irreversibility of finite-rate heat transfer, heat leakage and internal irreversibility ... A is the heat transfer area, h is the convection heat transfer coefficient between the working fluid and the reservoir, and t is the time of releasing heat process. The radiation heat transfer

Ngày tải lên: 05/09/2013, 15:28

... overall heat transfer coefficient and F1 is the heat-transfer surface area of the hightemperature-side heat exchanger , β is the overall heat transfer coefficient and F2 is the heat-transfer ... deriving force of TH − THC , QLC is the rate of heat flow from working fluid to the heat sink due to the deriving force of TLC − TL , QH is rate of heat transfer supplied by the heat source, and ... Carnot heat engine with the losses of heat-resistance, heat leakage and internal irreversibility, in which the transfer between the working fluid and the heat reservoirs obeys a complex heat transfer

Ngày tải lên: 05/09/2013, 15:28

... of sample thickness for 200-fs pulses. FEMTOSECOND LASER PROCESSING OF METAL 227 [...]... C L Tien, Heat Transfer Mechanisms during Short-Pulse Laser Heating of Metals, ASME J Heat Transfer, ... describes the absorpt ion of heat by the electron system from the laser, the heat diffusion among the electrons, and transfer of heat to the lattice. S is the laser heating source term, defined ... model looks at the heati ng mechanism as consisting of three processes: the absorption of laser energy by the electrons, the transport of energy by the elec- trons, and heating of the lattice by

Ngày tải lên: 06/05/2014, 08:53

... terms of amount of heat transferred. Nanofluids Four square cross section tube geometries were examined for flow of nanofluid suspensions of water-Al 2 O 3 with nanoparticle concentration of 1%. ... validate our model with an experimental nanofluid heat transfer by Anoop e t al. [19], which has error of ap proxi- mately 4%. The heat transfer perform ance of nanofluid flows in circular tube with ... application of coiled tubes using nanofluids to improve heat transfer performance is investigated. Coiled tubes have been known as one of the passive heat transfer enhancement techniques in heat and

Ngày tải lên: 21/06/2014, 03:20

... mechanisms of heat transfer in nanofluids. The knowledge of the physical mechan- isms of heat transfer in nanofluids is of vital importance as it will enable the exploitation of their full heat trans- ... addresses the following questions: a. What are the general heat transfer characteristics of nanofluids? b. What are the trends linking the heat transfer per- formance of certain nanofluids with their ... a concise statistical review analysis of a large amount of publications regarding the anomalous heat transfer modes of nanofluids. The application of nanofluids as coolants is a novel practise

Ngày tải lên: 21/06/2014, 03:20

... 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

... 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

... "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

... 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

... 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