NUMERICAL METHODS IN HEAT TRANSFER PDF

the Whitaker’s method is at variance with Greenkorn experimental results, it still do give the correct lower limit result for a homogeneous, uniform, isotropic medium. 4. References [1] Rudd CD, Long AC, Kendall KN, Mangin CGE. Liquid molding technologies. Woodhead Publishing Ltd; 1997. [2] Chan, A.[r]

* PgEnds: PageBreak[158],(116)BOOKCOMP, Inc. — John Wiley & Sons / Page 159 / 2nd Proofs / Heat Transfer Handbook / BejanGRAPHS OF THERMOPHYSICAL PROPERTIES159123456789101112131415161718192021222324

Republic of ChinaFull list of author information is available at the end of the articleTeng et al. Nanoscale Research Letters 2011, 6:488http://www.nanoscalereslett.com/content/6/1/488© 2011 Teng et al; licensee Springer. This is an Open Access article distributed under the terms of the Creative Com[r]

(vap.) 1.3614 1.4656 1.5825 1.6484 1.7212 1.8028 1.8957 2.0031 2.1290 2.2788 2.4494cp(liq.) 2.1869 2.3279 2.5802 2.7406 2.9274 3.1507 3.4333 3.8296 4.4951 6.1004 20.603cp(vap.) 1.6777 1.8543 2.0974 2.2624 2.4748 2.7607 3.1683 3.8008 4.9329 7.6836 30.312w (liq.) 1574.9 1180.1 937.04 839.03 748.75 662[r]

The analysis for a circular pipe has also been extended to include insulationboundaries that form equilateral polygons, rectangles, and concentric circles. Suchconfigurations require a two-dimensional conduction analysis and have led to theconclusion that the concept of critical perimeter of insulati[r]

(4.52)The numerical values are given in Table 4.4.A comparison of the values for the isothermal rectangular area and the isothermalelliptical area reveals a very close relationship. The maximum difference of approxi-mately −0.7% is found at a/b = 4. It is expected that the close agreem[r]

β= β +π − θ2(9.14)As a consequence, the energy required for formation of a bubble is less at thesecavities than on a planar surface or in the bulk, and therefore bubble nucleation occurspreferentially at a cavity. Larger cavities with large θ give a value of βcloser to β thansmaller cavitie[r]

Coiled tubes SuctionSurface tension devices Jet impingementAdditives for liquidsAdditives for gasesCompound EnhancementTwo or more passive and/or active techniquesthat are employed togetheror geometrical modifications to the flow channel, or incorporate an insert, material,or additional device. Except[r]

engines are widely used for aircraft propulsion include that theyare light, compact, and have a high power-to-weight ratio. Asshown in Figure 1, there are three main components of a gasturbine engine: compressor, combustor, and turbine. The compressor is used to compress the intake air to a s[r]

Pipes (3rd Report, Theoretical Analysis under the Condition of Uniform Wall Temperatureand Practical Formulae), Int. J. Heat Mass Transfer, 10, 681–695.Mori, Y., and Nakayama, W. (1967c). Forced Convection Heat Transfer in a Straight PipeRotating around a Parallel[r]

459Chapter18Engineering Fundamentals:Part 3Heat Transfer18.1 IntroductionThis chapter presents a basic overview of heat transfer fundamentals,particularly as they apply to HVAC. For a detailed, rigorous treat-ment, the reader should refer to a good college-level text on <[r]

[612],(40)that it is not proper to specify all N heat fluxes: because from conservation of energy,Ni=1Qi= 0, this amounts to only N − 1 specifications). As for black enclosures,holes are modeled as cold black surfaces; because for such surfaces Ebi= Ji= 0,they do not appear in eq. (8.68[r]

If radiation impinging on a solid or liquid layer is considered, a fraction of theenergy will be reflected (reflectance ρ, often also referred to as reflectivity), anotherfraction will be absorbed (absorptance α, often also referred to as absorptivity), andif the layer is thin enough, a fraction may be[r]

Rax=gβ(Tw− T∞)x3να(7.53)Employing the available experimental information, the appropriate value of n is givenas 6. With this value of n, the preceding correlation was found to give Nusselt numbervalues quite close to the experimental results. A temperature overshoot was notconsidered, since the expe[r]

———Normal PagePgEnds: TEX[733],(15)The magnitude and nature of the enhancement is a function of the (1) electric field,(2) flow parameter, and (3) heat transfer surface (Ohadi, 1991). The field potential,its polarity, and the electrode geometry and spacing determine the electric field. The[r]

for mass fluxes over 25 kg/s · m2, where the relationship was not even monotonic.Annular Flow Correlations The annular flow correlations that were selected forcomparison with the experimental data encompass at least one member of each ofthe three broad classes: two-phase multiplier correlations (Shah,[r]

0.3–30.18–0.90.260.150.120.050.0015Figure 5.13 Friction factor for duct flow. (From Bejan, 1995; drawn after Moody, 1944.)Figure 5.13 also documents the effect of wall roughness. It is found experimentallythat the performance of commercial surfaces that do not feel rough to the touchdeparts from the[r]

Turbulent Prandtl Number An assumption of PrT= 1 has been made in theforegoing analyses. The turbulent Prandtl number is determined experimentally usingPrT=uv(∂¯T/∂y)vT(∂ ¯u/∂y)(6.144)Kays and Crawford (1993) have pointed out that, in general, it is difficult to measureall four quan[r]

0dx0dx0+ki=1∂θ(x0i,x,0)∂y∆T0,i(6.66)This procedure using the integral momentum equation can also be generalized toa turbulent boundary layer with an arbitrary surface temperature variation.6.4.8 Two-Dimensional Nonsimilar FlowsWhen similarity conditions do not apply, as in the case of an unh[r]

[487],(49)Offset Strips Offset arrangements of plates or strips (Fig. 6.1d) reproduced withthe addition of the symbols in Fig. 6.18 offer the advantage of heat transfer enhance-ment. The boundary layer development is interrupted at the end of the strip and thenresumes from the l[r]