Conjugate Heat and Mass Transfer in Heat Mass Exchanger by Li-Zhi Zhang

By Li-Zhi Zhang

Conjugate warmth and Mass move in warmth Mass Exchanger Ducts bridges the distance among basics and up to date discoveries, making it a priceless device for somebody trying to extend their wisdom of warmth exchangers. the 1st publication out there to hide conjugate warmth and mass move in warmth exchangers, writer Li-Zhi Zhang is going past the fundamentals to hide fresh developments in gear for strength use and environmental keep an eye on (such as warmth and moisture restoration ventilators, hole fiber membrane modules for humidification/dehumidification, membrane modules for air purification, desiccant wheels for air dehumidification and effort restoration, and honeycomb desiccant beds for warmth and moisture control). Explaining the information in the back of and the functions of conjugated warmth and mass move makes it possible for the layout, research, and optimization of warmth and mass exchangers. Combining this lately chanced on info into one resource makes it a useful reference for execs, teachers, and different events.

  • A research-based procedure emphasizing numerical equipment in warmth mass transfer
  • Introduces easy info for exchangers' layout (such as friction components and the Nusselt/Sherwood numbers), tips on how to clear up conjugated difficulties, the modeling of assorted warmth and mass exchangers, and more
  • The first ebook to incorporate lately came upon developments of mass move and fluid circulation in channels constituted of new materials
  • Includes illustrations to visually depict the book's key concepts

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Position “e” refers to the east boundary of the control volume P. ” Point NE/2 refers to the center of meshes P-N-NE-E, and point SE/2 refers to the center of meshes P-S-SE-E. 12 Grid numbering on the ξ–η plane (position index, i, j). 13 Grid numbering on the z*–η plane (position index, k, j). 112) 46 CHAPTER 2 Conjugate Heat and Mass Transfer in Adsorbent Ducts where 0 aP = a E + a W + a N + a S + a B + a T + a P Jc 0 aP = 3 �τ θNE/2 − θSE/2 c cx λs β λs β + b1 = − x (�ξ )P J e (�η)e (�ξ )P J cy cy θNE/2 − θNW/2 λs β λs β − + (�η)P J n (�ξ )n (�η)P J b2 = Jc4 ∗ �wP �τ ; cx (�ξ )P 1 ; (�η)n aE = θNW/2 − θSW/2 w (�η)w θSE/2 − θSW/2 (�ξ )s s cx 1 1 λs α ; aW = (�ξ ) (�ξ ) J (�ξ )w e P e W cy cz J 1 λs γ λs aS = ;a = ∗ ∗ (�η)P J s (�η)s B (�z )P �z λs α J cy λs γ (�η)P J n cz J λs ; aT = ∗ ∗ (�z )P �z t θNE/2 − θSE/2 θ + θNE − θS − θSE = N (�η)e 4(�η)e aN = b ∗ Control volume on physical plane: �V = J�ξ �η�z .

3) Fluids flow in straight ducts while exchanging heat and mass with adsorbent walls. This is similar to common plate-fin heat exchangers. However, the wall temperatures and concentrations are temporal. The boundary conditions on wall surfaces change with time. This is quite different from common plate-fin heat exchangers, which always work in steady-state conditions. For adsorbent beds, the transient behaviors should be investigated. 2 Current researches on honeycomb type adsorbent beds Honeycomb-type adsorbents beds have attracted much attention in air dehumidification and enthalpy recovery.

Transitional energy and mass balance equations should be set up for the nodes at boundaries to calculate the properties of these nodes. 113) should be used to calculate boundary values, for a more accurate solution. 14 shows a boundary node P in the solid. The neighboring node N is on the air side. The airside properties should be used to calculate the flux from the air side. 13. 5JΔξΔηΔz*. Taking temperature as an example, the final heat balance equation for the boundary node P can be revised from Eq.

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