heat transfer to fluids with phase change
molecular dynamics simulation of heat transfer and phase change during
... 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 in cells at the bottom The heat flux q ... calculation among the lattice and enabled them to study a larger system with 160,000 atoms Heat conduction by the electron gas, which dominated heat transfer in metal, could not be predicted by ... computer resources, most work was restricted to systems with a small number of atoms, thus only qualitative results such as the structural change due to heating were obtained For instance, using...
Ngày tải lên: 06/05/2014, 08:55
molecular dynamics simulation of heat transfer and phase change during
... 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 in cells at the bottom The heat flux q ... calculation among the lattice and enabled them to study a larger system with 160,000 atoms Heat conduction by the electron gas, which dominated heat transfer in metal, could not be predicted by ... computer resources, most work was restricted to systems with a small number of atoms, thus only qualitative results such as the structural change due to heating were obtained For instance, using...
Ngày tải lên: 06/05/2014, 08:57
molecular dynamics simulation of heat transfer and phase change during
... 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 in cells at the bottom The heat flux q ... calculation among the lattice and enabled them to study a larger system with 160,000 atoms Heat conduction by the electron gas, which dominated heat transfer in metal, could not be predicted by ... computer resources, most work was restricted to systems with a small number of atoms, thus only qualitative results such as the structural change due to heating were obtained For instance, using...
Ngày tải lên: 06/05/2014, 08:59
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 ... 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 ... 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
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 ... Carnot heat engine with the losses of heat resistance, heat leakage and internal irreversibility, in which the heat transfer between the working fluid and the heat reservoirs obeys a complex heat transfer...
Ngày tải lên: 05/09/2013, 15:28
An experimental investigation of heat transfer and fluid flow in a rectangular duct with inclined discrete ribs
... with the enhancement of heat transfer to correlate the flow field investigation with the mechanism of heat transfer Experimental setup Two experimental set-ups, one for heat transfer analysis and ... augmented heat transfer and friction in asymmetrically heated rectangular ducts with ribs on the heated wall in transverse, inclined, V-continuous and V- discrete pattern Int Journal of Heat Mass Transfer ... wall of the rectangular duct is to be subjected to uniform heat flux (to substitute insolation) while the remaining three walls are to be kept insulated Many investigators [13-19] have employed artificial...
Ngày tải lên: 05/09/2013, 16:10
Heat transfer enhancement through inner grooved copper tubes with different tube parameters
... Numerical analysis of heat transfer in the annular flow regime J Heat Transfer, 122:80-91 [5] Cavallini, A., Col, D.D., Doretti, L Longo, G.A and Rossetto, L 2000 Heat transfer and pressure drop ... of two -phase heat transfer, pressure drop, and the effect of void fraction in inner grooved tubes Valladares [19] reported that additional work was needed to develop a generalized heat transfer ... expressed heat transfer and friction characteristics for single -phase flow in single-grooved and cross grooved micro-fin tubes They have found that the microfin tubes have enhanced heat transfer to...
Ngày tải lên: 05/09/2013, 16:10
Experimental study of passive cooling of building facade using phase change materials to increase thermal comfort in buildings in hot humid areas
... to the melting point (PCM changes from solid to liquid state) [6] As the temperature cools down, the PCM return to solid phase and the latent heat is released This absorption and release of heat ... 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
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 ... that the solution with sgn (m) = :t:1 is identical to the solution for sgn (M) = with sgn (m) = T1 Increasing m from - c ~ to (unstable stratification) gives a zero wall heat flux with a temperature...
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 ... condition refers to Leidenfrost state refers to entrained liquid refers to the friction of a liquid flow with total mass flux refers to the friction of a flow with liquid mass flux refers to liquid...
Ngày tải lên: 02/04/2014, 15:22
introduction to thermal systems engineering thermodynamics, fluid mechanics, and heat transfer
... 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 ... 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 ... 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...
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 ... increases to 0915 s−0 cm−2 at 9[80Tc ð2Ł[ This large change in nucleation rate indicates a rapidly heated liquid could possess considerable stability with respect to spontaneous nucleation\ with an ... 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
Báo cáo hóa học: "A review on boiling heat transfer enhancement with nanofluids" doc
... information to know for their incorporation in heat- transfer applications The BHT coefficient is a measure of the heat transfer due to phase change of a liquid during boiling It is related to the heat ... mechanisms of heat transport in nanofluids Heat Transfer Eng 2009, 30:1136-1150 Kakac S, Pramuanjaroenkij A: Review of convective heat transfer enhancement with nanofluids Int J Heat Mass Transf ... working fluid with nanoparticles so far in the literature It would be interesting to compare water-based nanofluids with heattransfer data to be obtained for refrigerant-based nanofluids in the...
Ngày tải lên: 21/06/2014, 04:20
báo cáo hóa học:" Research Article Variable Viscosity on Magnetohydrodynamic Fluid Flow and Heat Transfer over an Unsteady Stretching Surface with Hall Effect" pot
... physical properties may change significantly with temperature changes To accurately predict the flow behaviour, it is necessary to take into account this variation of viscosity with temperature Recently, ... sheet with uniform heat flux,” International Communications in Heat and Mass Transfer, vol 12, no 1, pp 89–94, 1985 L J Grubka and K M Bobba, Heat transfer characteristic of a continuous surface with ... The present paper deals with variable viscosity on magnetohydrodynamic fluid and heat transfer over an unsteady stretching surface with Hall effect Fluid viscosity is assumed to vary as an exponential...
Ngày tải lên: 21/06/2014, 11:20
Báo cáo y học: "TLR2 and TLR4 triggering exerts contrasting effects with regard to HIV-1 infection of human dendritic cells and subsequent virus transfer to CD4+ T cells" docx
... termed transfer in trans or early transfer [17,18] Thus, by capturing HIV-1 at sites of viral entry into the body and transferring viruses to CD4+ T cells, immature mDCs may be critical to the ... Moreover, BV is associated with increased levels of proinflammatory cytokines (e.g IL-1β and IL-8) and these cytokines induce the secretion of other proinflammatory cytokines or recruit other immune ... myeloid-like DCs, to be productively infected with HIV-1 and transfer virus to susceptible CD4+ T cells Results In this study, we made use of agonists specific for various TLRs known to be expressed...
Ngày tải lên: 12/08/2014, 23:20
Finite time exergoeconomic 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 low-temperature heat exchangers are finite The total heat transfer surface area ( F ) of the two heat exchangers is assumed to be ... the 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 ... due to the driving force of TH − THC , QLC is due to the driving 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 heat...
Ngày tải lên: 09/09/2015, 10:06
Performance analysis of an endoreversible rectangular cycle with heat transfer loss and variable specific heats of working fluid
... the effects of combustion and heat transfer α is a parameter related to the combustion and it reflects the heating value of the fuel β is a parameter related to heat transfer loss In this case, ... rectangular cycle with heat transfer loss and studied the performance characteristics of the cycle Liu et al [26] modeled irreversible rectangular cycle with friction loss and heat transfer loss ... pp.73-80 heats of the working fluid Chen et al [23] modeled a class of universal heat engine cycle with friction loss and heat transfer loss by considering the effect of variable specific heats...
Ngày tải lên: 09/09/2015, 10:17
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 ... pressure and density of vapor and this expression changes with vapor characteristics and inside diameter of evaporator The transfer of heat into a heat pipe produces a temperature gradient across ... found to be in reasonable agreement with correlations of Rohsenow [2] and Imura [3] Figure shows the experimental data of Noie [10] for heat transfer coefficient of evaporator Figure Heat transfer...
Ngày tải lên: 09/09/2015, 10:32
Multi level phase change random access memory (PCRAM) devices with ultrathin barrier layers
... layered Phase Change Memory Devices with a NGST/Ta2O5/GST Stack …………………… …122 7.1.2 Multi-level phase change memory devices with Si3 N4 or Ta2O5 barrier layers …………………………………….123 7.1.3 Effect of Top ... Two-bit multi-level phase change memory devices with a triple phase change material stack …………………… 125 7.1.5 Suppression of Resistance Drift Phenomenon in Multi-level Phase Change Memory Devices ... of phase change memory The PCRAM cell stores data using the two structural phases of GST, namely the amorphous and the crystalline phases [17]-[20], [39] These structural phases can be interchanged...
Ngày tải lên: 10/09/2015, 09:21