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

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 necessary device for an individual 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 apparatus for power use and environmental regulate (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 at the back of and the purposes of conjugated warmth and mass move makes it possible for the layout, research, and optimization of warmth and mass exchangers. Combining this lately stumbled on facts into one resource makes it a useful reference for pros, teachers, and different events.

  • A research-based technique emphasizing numerical tools in warmth mass transfer
  • Introduces simple facts for exchangers' layout (such as friction components and the Nusselt/Sherwood numbers), how you can resolve conjugated difficulties, the modeling of varied warmth and mass exchangers, and more
  • The first ebook to incorporate lately found 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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Extra info for Conjugate Heat and Mass Transfer in Heat Mass Exchanger Ducts

Example text

It is more practical to evaluate the peripherally mean local Nusselt and Sherwood numbers along the duct. 39) where hL is the peripherally mean and axially local heat transfer coefficient, and subscripts “w” and “b” refer to “wall” and “bulk” respectively. 41) Substituting the above equation to Eq. 46) ∗ As will be discussed later, the local Nusselt number and the local Sherwood number decrease asymptotically from very high values near the entrance of a duct to certain fully developed values at the end of thermal or mass entry length.

At the same time, using the method proposed by Thomas and Middlecoff [18] for selecting P, Q, Eqs. 100) In the above expressions, x and y refer to the dimensionless coordinates, if normalized coordinates are used on the physical plane. The numerical value of φ at each grid point along the horizontal boundary η = ηb in terms of boundary values x, y is computed once the differential operators are replaced by central-difference operators in Eq. 99). The values of φ at internal mesh points are computed by linear interpolation along the vertical mesh lines ξ = const.

However, the cross section in this case is a sinusoidal one. To facilitate the solution, a boundary-fitted coordinate transformation technique is used to transfer the sinusoidal domain to a square domain. Another benefit with this methodology is that the program can be easily modified to calculate other ducts of arbitrary cross-sectional shapes, as long as the grid points on the boundaries are specified. This will provide a broad basis for program validation. The basic idea of the boundary-fitted coordinate system is to have a coordinate system such that the body contour coincides with the coordinate lines.

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