By Seyed Mostafa Ghiaasiaan
This ebook was once built in the course of Professor Ghiaasiaan's ten years of training a graduate-level path on convection warmth and mass move and is extra greater by way of his 20 years of training event. The ebook is perfect for a graduate path facing the idea and perform of convection warmth and mass move. The publication treats well-established concept and perform yet can be enriched through its insurance of recent parts similar to circulation in microchannels and computational fluid dynamics-based layout and research equipment. The ebook is basically curious about convection warmth move. necessities of mass move also are lined. The mass move fabric and difficulties are provided such that they are often simply skipped. The booklet is richly improved through examples and end-of-chapter workouts. options can be found for certified teachers. The ebook contains 18 appendices delivering compilations of such a lot crucial estate and mathematical details for research of convective warmth and mass move processes
''This booklet was once constructed in the course of Professor Ghiaasiaan's ten years of training a graduate-level path on convection warmth and mass move and is additional improved by means of his 20 years of training adventure. The booklet is perfect for a graduate path facing the idea and perform of convection warmth and mass move. The e-book treats well-established thought and perform yet can also be enriched via its assurance of recent parts equivalent to movement in microchannels and computational fluid dynamics-based layout and research tools. The ebook is basically fascinated with convection warmth move. necessities of mass move also are lined. The mass move fabric and difficulties are provided such that they are often simply skipped. The ebook is richly superior via examples and end-of-chapter routines. recommendations can be found for certified teachers. The e-book comprises 18 appendices supplying compilations of so much crucial estate and mathematical info for research of convective warmth and mass move processes''-- Read more... desktop generated contents be aware: 1. Thermophysical and shipping basics; 2. Boundary layers; three. exterior laminar movement: similarity strategies for pressured laminar boundary layers; four. inner laminar circulation; five. fundamental tools; 6. basics of turbulence and exterior turbulent movement; 7. inner turbulent move; eight. influence of transpiration on friction, warmth and mass move; nine. Analogy between momentum, warmth, and mass move procedures; 10. ordinary convection; eleven. combined convection; 12. Turbulence delivery versions; thirteen. stream and warmth move in miniature channels
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Additional info for Convective heat and mass transfer
38) from Eq. 33) to derive the thermal energy equation: ρ ∂u ∂v ∂w Du = ∇ · (k∇T) + σxx + σ yy + σzz + τxy Dt ∂x ∂y ∂z ∂v ∂w + ∂z ∂y + τ yz ∂u ∂w + . 39) This equation is equivalent to Eq. 36). We can further manipulate Eq. 40) where τ is the viscous stress dyadic tensor whose elements for a Newtonian fluid, in Cartesian coordinates, are τi j = μ ∂ uj ∂ ui + ∂ xj ∂ xi + δi j λ ∇ · U. 41) The last term on the right-hand side of Eq. 40) is the viscous dissipation term, μ . The thermal energy equation then becomes ρ Du = ∇ · (k∇T) − P ∇ · U + μ .
11) assumes that all vapor molecules that collide with the interphase condense and none is reflected. 13) where is a correction factor and depends on the dimensionless mean velocity of vapor molecules that cross the s surface, namely −mev,net /ρv , normalized with the mean molecular thermal speed 2Ru Tv /Mv , defined to be positive when net condensation takes place: a=− mev,net ρv 2Ru Tv Mv −1/2 ≈− mev,net Pv Ru Tv , 2Mv = exp −a 2 + aπ 1/2 [1 + erf (a)] . 15) The effect of mean molecular velocity needs to be considered only for vapor molecules that approach the interphase.
10. The solution will be XO2 ,L − XO2 ,u y = erf √ . 12 × 10−5 m2 /s. 02 × 10−5 . We can find the oxygen molar flux at the surface after 5 min by using Eq. 36 kmol/m3 . 78 × 10−6 kg/m2 /s. 5 Convention for Thermal and Mass Transfer Boundary Conditions A wide variety of thermal and mass transfer boundary conditions can be encountered in practice. Standard thermal and mass transfer boundary condition types are often used in theoretical models and experiments, however. Besides being among the most widely encountered boundary conditions, these standard boundary conditions can approximate many more complicated boundary conditions that are encountered.
Convective heat and mass transfer by Seyed Mostafa Ghiaasiaan