heat transfer to fluids without phase change
molecular dynamics simulation of heat transfer and phase change during
... constant heat flux q ′′ is applied to the 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 ... conditions, atoms are easier to expand in space when heated Therefore, more heat is stored in the form of potential energy and resulting in a larger specific heat The specific heat at constant volume ... interaction between metallic atoms and the laser beam in a system consisting of 13 atoms or less [1, 2] Their work was focused on the structural change of metallic atoms due to laser beam absorption...
Ngày tải lên: 06/05/2014, 08:55
molecular dynamics simulation of heat transfer and phase change during
... constant heat flux q ′′ is applied to the 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 ... conditions, atoms are easier to expand in space when heated Therefore, more heat is stored in the form of potential energy and resulting in a larger specific heat The specific heat at constant volume ... interaction between metallic atoms and the laser beam in a system consisting of 13 atoms or less [1, 2] Their work was focused on the structural change of metallic atoms due to laser beam absorption...
Ngày tải lên: 06/05/2014, 08:57
molecular dynamics simulation of heat transfer and phase change during
... constant heat flux q ′′ is applied to the 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 ... conditions, atoms are easier to expand in space when heated Therefore, more heat is stored in the form of potential energy and resulting in a larger specific heat The specific heat at constant volume ... interaction between metallic atoms and the laser beam in a system consisting of 13 atoms or less [1, 2] Their work was focused on the structural change of metallic atoms due to laser beam absorption...
Ngày tải lên: 06/05/2014, 08:59
Experimental study of passive cooling of building facade using phase change materials to increase thermal comfort in buildings in hot humid areas
... [5] PCMs store latent heat as the ambient temperature rises up to the melting point (PCM changes from solid to liquid state) [6] As the temperature cools down, the PCM return to solid phase and ... Materials The sensible heat storage capacity of building materials has been recognized since ancient times Heating a liquid or a solid, without changing phase is called sensible heat storage However, ... rationale for the development of latent heat storage in building materials Heating a material which undergoes a phase change (usually melting) is called latent heat storage The characteristics of PCMs...
Ngày tải lên: 05/09/2013, 17:03
![Báo cáo Y học: Effect of adenosine 5¢-[b,c-imido]triphosphate on myosin head domain movements Saturation transfer EPR measurements without low-power phase setting ppt](https://media.store123doc.com/images/document/14/rc/vd/medium_vdd1395606111.jpg)
Báo cáo Y học: Effect of adenosine 5¢-[b,c-imido]triphosphate on myosin head domain movements Saturation transfer EPR measurements without low-power phase setting ppt
... variance To apply this procedure to a given sample and to obtain the in -phase and out-of -phase spectra, two independent data sets (two spectra) are required for the same sample, for which the phase ... arbitrary phase angle J, and sp2(i) is recorded at a phase angle J + 90 Linear transformation of the two spectra through the calculated phase angle J allows the second harmonic in -phase and outof -phase ... is the phase angle, and A(i) and B(i) are the amplitudes of the in -phase and out-of -phase components Differentiating S with respect to variables m and J, and setting the derivatives equal to zero...
Ngày tải lên: 24/03/2014, 03:21
convective heat transfer mathematical and computational modelling of viscous fluids and porous media
... lead to critical structural damage in the piping systems of nuclear reactors The buoyant flow arising from heat rejection to the atmosphere, heating of rooms, fires, and many other such heat transfer ... and are to be found A simple model has been proposed by Lee and Yovanovich (1991, 1992) to predict the heat transfer characteristics due to a vertical plate which is subject to a step change in ... the topic of convective heat and mass transfer However, to the best of our knowledge, the last monograph on this topic is that published by Gebhart et al (1988) Therefore, it is pertinent now to...
Ngày tải lên: 01/04/2014, 10:51
boiling heat transfer and two-phase flow, second edition
... xxvii te tot TP TPF vert ups (W-3 ) refers to liquid crossflow due to reentrainment refers to total condition refers to two -phase refers to two -phase friction refers to vertical flow refers to upstream ... refers to saturated liquid refers to phase change from liquid to vapor refers to forced convection refers to gas, or vapor, condition refers to grid spacer refers to inner diameter refers to interfacial ... and Control FORTHCOMING TITLES Tong and Tang, Boiling Heat Transfer and Two -Phase Flow, Second Edition BOILING HEAT TRANSFER AND TWO -PHASE FLOW Second Edition L S Tong, Ph.D Y S Tang, Ph.D Publishing...
Ngày tải lên: 02/04/2014, 15:22
introduction to thermal systems engineering thermodynamics, fluid mechanics, and heat transfer
... Radiative Exchange Between Surfaces in Enclosures 489 438 Convection Application: Heat Exchangers 446 17.50 Heat Exchangers 446 17.60 Chapter Summary and Study Guide Problems 458 456 18 Heat Transfer ... principles Water heaters are designed to achieve appropriate heat transfer characteristics so that the energy supplied is transferred to the water in the tank rather than lost to the surrounding ... laboratory-sized models to full-scale systems Heat transfer is concerned with energy transfer as a consequence of a temperature difference As shown in Fig 1.5, there are three modes of heat transfer...
Ngày tải lên: 02/04/2014, 16:45
Experimental and numerical investigation of heat transferand phase change phenomena during excimer laser interactionwith nickel
... evaporation to homogeneous\ explosive phase change occurs at a laser ~uence of about 4[1 J cm−1[ 2[ Numerical modeling Numerical modeling is carried out to compute the heat transfer and phase change ... equation[ Under rapid heating\ it is possible to superheat the liquid metal to a metastable state\ i[e[\ the surface pressure is lower than the saturation pressure corresponding to the surface tem! ... transition from superheated liquid to a mixture of vapor and liquid droplets[ The explosive phase change phenomenon was _rst investigated in detail in the earlier work of pulsed current heating of metals...
Ngày tải lên: 06/05/2014, 08:55
Experimental investigation and comparison of heat transfer coefficient of a two phase closed thermosyphon
... In this study the heat transfer coefficient of condenser and evaporator and the heat transfer limits were investigated The analytical heat transfer coefficient and the heat transfer limits and ... In which q e is the applied heat flux in the evaporator section Although thermosyphons are very efficient heat transfer devices, they are subject to a number of heat transfer limitations These ... were used to show the temperatures measured by thermocouples The two phase closed thermosyphon was surrounded by 40 mm thickness of glass wool for insulating and stopping the heat transfer to the...
Ngày tải lên: 09/09/2015, 10:32
Numerical and experimental investigation of single and two phase impinging jet heat transfer
... method to transfer heat from heat sources to the surfaces exposed to various cooling fluids, as shown in Fig 1.2 In this method, the design of the heat sink significantly affects the heat transfer ... increase of heat dissipation rate required by electronic components, single phase heat transfer will eventually not be sufficient to meet the demand Thus, two -phase heat transfer (boiling heat transfer) ... become a topic receiving increasing attention of major interest in the electronic cooling field Compared with single phase heat transfer, twophase heat transfer can increase the heat transfer...
Ngày tải lên: 14/09/2015, 13:31
Encapsulation of phase change materials for heat storage
... Tm Q = total amount of heat storage/release (J) m = mass of heat storage material (g) cp = specific heat capacity of heat storage material (J kg-1 °K-1) Tm = melting temperature of heat storage ... final temperatures of heat storage medium (°C) ∆H fusion = heat required to change from solid phase to liquid phase (J/g) 12 Chapter Literature Review In a latent heat storage system, the sensible ... Thorton, 1982; Telkes (1980); Yamagishi, 1999) In the case of microencapsulated phase change slurry, the phase change material is encapsulated and suspended in heat transfer fluid to form phase change...
Ngày tải lên: 05/10/2015, 21:22
Effect of periodic suction on three dimensional flow and heat transfer past a vertical porous plate embedded in a porous medium
... -6.4648 4.4 Rate of heat transfer The rate of heat transfer at the wall i.e the heat flux in terms of Nusselt number Nu for different values of α and Kp are entered in Table The heat flux at the ... transfer effects on MHD flow and heat transfer past a vertical porous plate through a porous medium under oscillatory suction and heat source Int J Heat Mass Transfer 2009, 52, 5962-5969 S S ... A1 B − A2 B − B − m )cos πz , (50) τz = − εα A1 A2 sin π z π 3.2 Rate of heat transfer The rate of heat transfer i.e heat flux at the wall in terms of Nusselt number (Nu) is given by ⎛ dθ ⎞ ⎛...
Ngày tải lên: 05/09/2013, 14:58
Increasing energy efficiency of HVAC systems of buildings using phase change material
... pp.667-686 669 1.4 Phase change material layers The addition of a phase change material (PCM) into the external wall of a building has been shown to reduce the amount of energy required to cool the ... of 0.17 to account for the water vapor [19] Thus, radiation is transferred from the slab to the air and walls Note that after the radiation transfers heat to the walls, the portion of heat that ... O., Sircar A K., A Review of Phase Change Materials Research for Thermal Energy Storage in Heating and Cooling Applications at the University of Dayton from 1982 to 1986 International Journal...
Ngày tải lên: 05/09/2013, 15:28
Cooling load optimization of an irreversible refrigerator with combined heat transfer
... Carnot refrigerator based on a new generalized heat transfer law including generalized convective heat transfer law and generalized radiative heat transfer law has been derived [11] The heating load ... 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 ... refrigerator with internal and external irreversibilities working with combined heat transfer including convective and radiative heat transfer Analysis The model of an irreversible refrigerator is...
Ngày tải lên: 05/09/2013, 15:28
Ecological performance of a generalized irreversible Carnot heat engine with complex heat transfer law
... TL The heat- transfer surface areas ( F1 and F2 ) of high- and lowtemperature heat exchangers are finite The total heat transfer surface area ( F ) of the two heat exchangers is assumed to be a ... 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 QL is rate of heat transfer released to the ... the heat- transfer surface area of the hightemperature-side heat exchanger , β is the overall heat transfer coefficient and F2 is the heat- transfer surface area of the low-temperature-side heat...
Ngày tải lên: 05/09/2013, 15:28
Heat transfer and friction factor characteristics using continuous M shape ribs turbulators at different orientation on absorber plate solar air heater
... Trans ASME Journal of Heat Transfer 1984, 106, 774-81 [6] Han J.C., Park J.S Developing heat transfer in rectangular channel with rib turbulators Trans ASME Journal of Heat Transfer 1988, 31, 183-95 ... spacing in square rib shape and angle of attack on heat transfer and friction factor Vaun et al [8] investigated heat transfer and friction factor characteristics of combined transverse as well ... vortex generators Aharwal et al [29] reported heat transfer and fluid flow in rectangular duct with inclined discrete ribs Hans et al [30] investigated heat transfer and friction factor correlations...
Ngày tải lên: 05/09/2013, 15:28