heat transfer to immersed surfaces
introduction to thermal systems engineering thermodynamics, fluid mechanics, and 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 ... following topics useful in solving the heat transfer problems of ITSE Entering Equations from Text Reference Tables and Figures It has been our practice in the ITSE heat transfer chapters to summarize...
Ngày tải lên: 02/04/2014, 16:45
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
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
... 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 ... 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 ... rate of bypass heat leakage ( q ) from the heat source to the heat sink Thus QH = QHC + q and QL = QLC + q , where QHC is the rate of heat flow from heat source to working fluid due to the deriving...
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
... Glicksman L.R., Rohsenow W.M Heat transfer and friction for rib roughened surfaces Internatinal Journal of Heat Mass Transfer 1978, 21, 1143-56 [5] Han J.C Heat transfer and friction in channels ... 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 ... 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
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 ... Journal of Heat Transfer, 106, 774-781, 1984 [3] Han J.C., Glicksman LR and Rosenow WM Investigation of heat transfer and friction for ribroughened surfaces, Int Journal of Heat & Mass Transfer ... transverse ribs shows 10-15% higher heat transfer coefficient as compared to continuous transverse ribs, whereas inclined discrete ribs give 10 to 20% higher heat transfer rate than that of the transverse...
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 ... procedure to evaluate the heat transfer coefficients of internally grooved copper tubes 3.1 Test facility The test used to conduct this study is capable of measuring in-tube average and local heat transfer ... h fg ⎩ m r ⎭ ( ) (5) The refrigerant side heat transfer coefficient is determined from the overall heat transfer coefficient and the annulus side heat transfer coefficient, ho, which is determined...
Ngày tải lên: 05/09/2013, 16:10
The Thermodynamics, Heat Transfer, and Fluid Flow Fundamentals Handbook
... be converted into an equivalent amount of heat and that heat could be converted into work EO 1.8 DEFINE the following: a Heat b Latent heat c Sensible heat d Units used to measure heat EO 1.9 DEFINE ... referred to simply as the heat transferred per unit mass q Q m (1-16) where: q = heat transferred per unit mass (Btu/lbm) Q = heat transferred (Btu) m = mass (lbm) Example: Determine the heat transferred ... 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, no...
Ngày tải lên: 22/10/2013, 10:15
Tài liệu HEAT TRANSFER FUNDAMENTALS P1 ppt
... heat transfer, phase change heat transfer, that is, boiling and condensation, will be treated as a subset of convection heat transfer 43.2 CONDUCTION HEAT TRANSFER The exchange of energy or heat ... subject to heat losses (or gains) through convection from Fig 43.2 Heat transfer by extended surfaces Table 43.11 Temperature Distribution and Heat Transfer Rate at the Fin Base (m = VhcTkA) T-TX Heat ... fashion is referred to as radiant energy and the heat transfer process that occurs is called radiation heat transfer or simply radiation In this mode of heat transfer, the energy is transferred through...
Ngày tải lên: 23/01/2014, 07:20
Tài liệu HEAT TRANSFER FUNDAMENTALS P2 pdf
... Boiling The heat transfer from a surface to a liquid is due to both convection and radiation A total heattransfer coefficient is defined by the combination of convection and radiation heat- transfer ... resistance to heat transfer between the vapor and the surface Therefore, it is desirable to use short vertical surfaces or horizontal cylinders to prevent the condensate from growing too thick The heat- transfer ... Convection," J Heat Transfer 82, 214 (1960) 16 S Globe and D Dropkin, "Natural Convection Heat Transfer in Liquids Confined between Two Horizontal Plates," / Heat Transfer 81C, 24 (1959) 17 I Catton, "Natural...
Ngày tải lên: 23/01/2014, 07:20
heat transfer presentation (Tuan) pptx
... of 30 W/m·oC All the heat generated in the chips is conducted across the circuit board and is dissipated from the back side of the board to a medium at 40oC, with a heat transfer coefficient ... the circuit board Reference: http://www.csun.edu/~lcaretto Question a: Each chip dissipates: 0.04 W Thermal conductivity: k = 30 W/m.oC Heat transfer coefficient: h = 40 W/m.oC Temperature of front ... Determine the new temperatures on the two sides of the circuit board? The equation for the heat transfer from the finned surface in an equivalent circuit form to deduce the resistance. Writing this in terms of an Ohm’s law expression gives...
Ngày tải lên: 06/03/2014, 20:21
Heat Transfer Applications for the Practicing Engineer potx
... principles to where it is today.(15) Chapter History of Heat Transfer REFERENCES E LAYTON, History of Heat Transfer: Essays in the Honor of the 50th Anniversary of the ASME Heat Transfer Division, date ... with the transfer of energy and the conversion of energy into other forms of energy (e.g., heat into work), with consideration generally limited to systems in equilibrium The topic of heat transfer ... Overall Heat Transfer Coefficients 268 Fouling Factors 271 The Controlling Resistance 272 Varying Overall Heat Transfer Coefficients The Heat Transfer Equation References 279 276 278 15 Double Pipe Heat...
Ngày tải lên: 08/03/2014, 17:20
Tutorial lecture on nano heat transfer
... Computing (2) Nanoscale Data Storage Systems (1) Nanoscale Heat Transfer in Nano Transistors TWO DISRUPTIVE HEAT TRANSFER TECHNOLOIES (1) Nanoscale Heat Transfer in Nano Transistors Silicon substrate ... one atom or a set of atoms can be TRANSMITTED to other atoms in the way as described above (3) The initial vibration of one atom can thus be TRANSMITTED outward and cause many other atoms to vibrate ... among atoms Atomic vibration caused geometry change of lattice (bond) and more atoms to vibrate, and hence transmits thermal energy and thus HEAT Lattice vibration of atoms generates heat Fundamental...
Ngày tải lên: 15/03/2014, 23:15
Heat-transfer Equipment potx
... least value taken Heat- transfer factor, jh It is often convenient to correlate heat- transfer data in terms of a heat transfer “j” factor, which is similar to the friction factor used for pressure ... define the heat transfer factor as: 0.14 jH D NuPr 1/3 w Heat transfer factor, jh 10 10 −3 10−2 10−1 2 10 89 48 L/D = 24 500 10 789 240 Figure 12.23 4 10 789 Tube-side heat- transfer factor Reynolds ... general equation for heat transfer across a surface is: Q D UA1Tm where Q U A 1Tm D D D D 12.1 heat transferred per unit time, W, the overall heat transfer coefficient, W/m2 Ž C, heat- transfer area,...
Ngày tải lên: 17/03/2014, 14:20
doe fundamentals handbook - thermodynamics, heat transfer, and fluid flow - volume 1 of 3
... be converted into an equivalent amount of heat and that heat could be converted into work EO 1.8 DEFINE the following: a Heat b Latent heat c Sensible heat d Units used to measure heat EO 1.9 DEFINE ... referred to simply as the heat transferred per unit mass q Q m (1-16) where: q = heat transferred per unit mass (Btu/lbm) Q = heat transferred (Btu) m = mass (lbm) Example: Determine the heat transferred ... 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, no...
Ngày tải lên: 17/03/2014, 15:00
doe fundamentals handbook - thermodynamics, heat transfer, and fluid flow - volume 2 of 3
... is not physically connected to the heat transfer site Rev Page HT-02 CONDUCTION HEAT TRANSFER Heat Transfer CONDUCTION HEAT TRANSFER Conduction heat transfer is the transfer of thermal energy ... Convective Heat Transfer Coefficient The convective heat transfer coefficient (h), defines, in part, the heat transfer due to convection The convective heat transfer coefficient is sometimes referred to ... 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 fluid to another The...
Ngày tải lên: 17/03/2014, 15:00