relations data for heat transfer modes
Báo cáo hóa học: " Anomalous heat transfer modes of nanofluids: a review based on statistical analysis" doc
Ngày tải lên :
21/06/2014, 03:20
... of heat transfer due to conduction b Heat transfer enhancement studies via convection/ mixed heat transfer mode (91 observations) Strong evidence of heat transfer enhancement by nanofluids for ... of enhancement of heat transfer due to CHF e Proposed physical mechanisms for the anomalies of heat transfer An outline of all the proposed mechanisms for each type of heat transfer study is ... are found to augment the heat transfer coefficient of a given basefluid for every mode of heat transfer The most popular mechanisms for explaining the anomalous heat transfer were also presented...
- 37
- 338
- 0
RBF interpolation of boundary values in the BEM for heat transfer problems
Ngày tải lên :
16/06/2016, 01:11
... IRBFN schemes, respectively A new interpolation method for the evaluation of BIs For heat transfer problems, the governing equations take the form 72 u ¼ b; u ¼ u ; q; x [ V; x [ Gu ; ›u ¼ q ; ... equation (IE) formulations for heat transfer problems are well documented in a number of texts (Banerjee and Butterfield, 1981; Brebbia et al., 1984) Equations (13)-(15) can be reformulated in ... y(s) for arbitrary s from the known value of y(s) at a set of points s ð1Þ ; s ð2Þ ; ; s ðnÞ and therefore, the interpolation must model the function by some plausible functional form RBF The form...
- 22
- 446
- 0
Heat Transfer Applications for the Practicing Engineer potx
Ngày tải lên :
08/03/2014, 17:20
... in heat transfer The second Part of the book is concerned with heat transfer principles Topics that receive treatment include steady-state heat conduction, unsteady-state heat conduction, forced ... terms and definitions in heat transfer Since heat transfer is an important subject that finds wide application in engineering, the understanding of heat transfer jargon is therefore important to the ... Heat Transfer Applications for the Practicing Engineer Heat Transfer Applications for the Practicing Engineer Louis Theodore Copyright #...
- 664
- 844
- 0
Heat Transfer Applications for the Practicing Engineer pdf
Ngày tải lên :
28/06/2014, 22:20
... in heat transfer The second Part of the book is concerned with heat transfer principles Topics that receive treatment include steady-state heat conduction, unsteady-state heat conduction, forced ... terms and definitions in heat transfer Since heat transfer is an important subject that finds wide application in engineering, the understanding of heat transfer jargon is therefore important to the ... Heat Transfer Applications for the Practicing Engineer Heat Transfer Applications for the Practicing Engineer Louis Theodore Copyright #...
- 664
- 1.2K
- 2
Manipulation of turbulent flow for drag reduction and heat transfer enhancement 1
Ngày tải lên :
10/09/2015, 09:10
... and numerical works on heat transfer with dimple Their experimental data for dimples with different depth ratio (Burgess and Ligrani, 2005) show that augmentations in heat transfer rate almost remain ... 000 to 20,000 The achieved heat transfer enhancements is up to about 2.5 times, and even a decrease of pressure losses could be obtained for some cases Thereafter, heat transfer enhancement of dimples ... important factors affecting heat transfer enhancement and pressure loss on dimpled surface The data reported by Moon et al (2000) demonstrated that augmentations in heat transfer rate and pressure...
- 72
- 281
- 0
Manipulation of turbulent flow for drag reduction and heat transfer enhancement 2
Ngày tải lên :
10/09/2015, 09:11
... Aw is the heat transfer surface area, Q is the flow rate, and L is the length of channel No slip boundary condition (2.13) for velocity and constant heat flux boundary condition (2.14) for temperature ... long enough for calculation of mean data 58 2.4.1 Grid independence test Both the DNS and DES codes need to be validated and tested for grid independence before employing to calculate for the flow ... (1978) are calculated in order to evaluate the quantitative thermo-aerodynamic performance for the different heat transfer surface geometries The factors are described in terms of the Colburn factor...
- 24
- 232
- 0
Manipulation of turbulent flow for drag reduction and heat transfer enhancement 3
Ngày tải lên :
10/09/2015, 09:11
... asymptotic limit for flow rate 76 difference can also be obtained as lim ΔQ =0 ⎧ ⎪ ⎪ 3S ⎪ ⎪ ⎪ ⎨ lim ΔQ = α→0 ⎪ ⎪ ⎪ 3S ⎪ ⎪ ⎩ 32 S→0 for both Cases & (3.9) for Case (3.10) for Case 3.2.3 Global performance ... plate u’ for Flat plate 12 Plane 10 12 10 Plane Plane u’ u’ Plane Plane Plane 6 4 2 -1 -0.5 0 -1 -0.5 Y (a) Y (b) 2 v’ for corrugated plate w’2 for corrugated plate v’ for flat plate w’ for flat ... stress for corrugated channel and flat channel are both obtained by DES method The locations of these three planes can be found in Figure 3.19(a) 14 14 u’ for corrugated plate u’ for flat plate u’ for...
- 72
- 333
- 0
Manipulation of turbulent flow for drag reduction and heat transfer enhancement 4
Ngày tải lên :
10/09/2015, 09:11
... assess the performances such as the pressure loss Cf /Cf and heat transfer capacity N u/N u0 for different heat transfer surfaces, respectively 149 4.3 4.3.1 Global thermo-aerodynamic performance Symmetric ... (h/D=10%) Figure 4.8 shows the pressure loss and heat transfer capacity for Case (h/D = 10%, Table 4.1) For Case 2C (Dz = 0%), the heat transfer ratio 151 Performance ratio Cf/Cf0 of symmetric dimple ... Ga/Ga0 for Dz=0% Ga/Ga0 for Dz=15% 1.1 Performance ratio Performance ratio 1.1 0.9 Ga/Ga0 for Dz=0% Ga/Ga0 for Dz=15% 0.9 symmetric dimple 0.8 -0.2 -0.1 0.1 0.8 0.2 -0.1 Dx 0.1 Dx (a) Ga/Ga0 for...
- 44
- 238
- 0
Manipulation of turbulent flow for drag reduction and heat transfer enhancement 5
Ngày tải lên :
10/09/2015, 09:11
... performance factors for protrusions (d) performance factors for dimples Figure 5.3: Effect of h/D on Nusselt number, friction coefficient and performance factors: h/D stands for height ratio for ... volume of heat exchanger, although the area goodness factors are comparable which means the surface area of the heat exchanger is still similar 5.2.2 Distribution of local drag and heat transfer ... (a) Sm/Sm0 for original run (b) Sm/Sm0 for additional run Fm/Sm0 50 40 30 20 10 -10 Z 50 40 30 20 10 -10 Z Fm/Sm0 8 10 10 10 15 10 15 X X (c) F m/F m0 for original run (d) F m/F m0 for additional...
- 23
- 188
- 0
An efficient and robust algorithm for incompressible flow and its application in heat transfer enhancement
Ngày tải lên :
11/09/2015, 16:02
... the heat transfer performance when plenty of condensation water flows and weakens the heat transfer performance when little condensation water forms on the fin surface, the pressure drops for ... correlations on airside performance for plain fin-and-tube heat exchanger in wet conditions Niederer (1986) performed experiments to investigate the frosting and defrosting effects on the heat transfer ... alignment on heat transfer characteristics of fin-and-tube heat exchanger with large fin pitch Wang et al.(1997a) studied the heat transfer and pressure drop performance of plate finned tube heat exchangers...
- 251
- 366
- 0
An ice slurry system using direct contact heat transfer for cooling applications
Ngày tải lên :
14/09/2015, 08:23
... 2.3.3 20 24 26 Chapter Ice Slurry Heat Transfer Phenomena Heat transfer through circular ducts Heat transfer through rectangular channels Heat transfer: industrial heat exchanger MATHEMATICAL MODEL ... based on the heat transfer properties of the materials These correlations are discussed below Overall heat transfer coefficient In this model, the heat transfer coefficient for heat gain from ... comprehensive experiments were performed and approximated correlations were available for the determination of heat transfer for compact heat exchangers, there is still potential for further investigations...
- 172
- 334
- 0
Effect of periodic suction on three dimensional flow and heat transfer past a vertical porous plate embedded in a porous medium
Ngày tải lên :
05/09/2013, 14:58
... -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 ... 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 ⎞ ⎛ ... 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...
- 12
- 493
- 0
Cooling load optimization of an irreversible refrigerator with combined heat transfer
Ngày tải lên :
05/09/2013, 15:28
... generalized heat transfer law including generalized convective heat transfer law and generalized radiative heat transfer law has been derived [11] The heating load and coefficient of performance ... derive a relationship between cooling load and coefficient of performance based on a new generalized heat transfer law including generalized convective and generalized radiative heat transfer ... coefficient of the heat source and t is the time of absorbing heat process The emittance will be balanced uniformly by absorption for a thin slice of gas, i.e ε = α The radiation heat transfer coefficient...
- 10
- 634
- 0
Ecological performance of a generalized irreversible Carnot heat engine with complex heat transfer law
Ngày tải lên :
05/09/2013, 15:28
... 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 QL is rate of heat transfer released ... 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 ... ecological performance of irreversible Stirling , Ericsson and Brayton heat- engines [34, 35] In general, heat transfer is not necessarily linear Heat transfer law has a strong effect on the performance...
- 14
- 534
- 0
Heat transfer and friction factor characteristics using continuous M shape ribs turbulators at different orientation on absorber plate solar air heater
Ngày tải lên :
05/09/2013, 15:28
... transform in to turbulent flow It is ,therefore desirable that the turbulence must be created near the heat transferring surface and break the viscous sublayer for augumenting the heat transfer ... [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 for solar air heater duct ... 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...
- 16
- 598
- 0
An experimental investigation of heat transfer and fluid flow in a rectangular duct with inclined discrete ribs
Ngày tải lên :
05/09/2013, 16:10
... 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 other for fluid ... 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 ... on the heat transfer coefficient has been investigated and attempt has also been made to determine the optimum width of a gap in the inclined rib to form discrete rib for the better heat transfer...
- 12
- 831
- 0
Heat transfer enhancement through inner grooved copper tubes with different tube parameters
Ngày tải lên :
05/09/2013, 16:10
... correlation for inner grooved tubes Wang and Honda [20] evaluated the existing condensation heat transfer correlations for inner grooved tubes with their collected experimental heat transfer data Wang ... enhancing heat transfer in heat exchanger For both cases, i.e., condensation and evaporation, it is found that Tube B could perform better compared to Tube A Heat transfer coefficient for Tube ... an internally ribbed tube were compared for flow boiling heat transfer performance [43] The spirally, internally ribbed tube gave 1.4 - times the heat transfer coefficient and about the same...
- 12
- 553
- 0
Changes of temperature data for energy studies over time and their impact on energy consumption and CO2 emissions. The case of Athens and Thessaloniki – Greece
Ngày tải lên :
05/09/2013, 16:10
... Temperature data analysis 2.1 Air temperature Average temperature is a prime climate indicator and the basis for calculations of heating and cooling energy demand [1] or for estimating bin data and heating ... requirements for heating is 11.3% for Athens and 6.1% for Thessaloniki On the contrary, for the cooling period of the 1993-2002 decade, an increase of the energy demands of the building for both ... energy consumption for heating and the increase of energy consumption for cooling Analog results are observed for the CO2 emissions by the use of diesel oil and electricity for heating and cooling...
- 14
- 548
- 0