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 space among basics and up to date discoveries, making it a precious device for an individual trying to extend their wisdom of warmth exchangers. the 1st booklet 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 watch over (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 purposes of conjugated warmth and mass move allows the layout, research, and optimization of warmth and mass exchangers. Combining this lately came across facts into one resource makes it a useful reference for pros, teachers, and different events.

  • A research-based method emphasizing numerical tools in warmth mass transfer
  • Introduces simple information for exchangers' layout (such as friction components and the Nusselt/Sherwood numbers), how to remedy conjugated difficulties, the modeling of assorted warmth and mass exchangers, and more
  • The first e-book to incorporate lately stumbled on developments of mass move and fluid movement in channels made out 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

Sample text

91) The axial gradients of temperature and humidity in the solid at the inlet and outlet surfaces are also set to zero. 5 Boundary-fitted coordinates Commonly, a duct of rectangular cross section is easy to solve under the x–y coordinate system. 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.

53) where km is the internal mass transfer coefficient (1/s) of adsorbents, and weq is the equilibrium water content in solid at temperature T and humidity ratio ω. 5. 55) where Wmax is the maximum water uptake of the solid material (kg/kg), Cs is a constant called the shape factor for the material, and RH is air relative humidity. This sorption curve directly links water content to RH, a variable that can be directly measured. The curve can be used to calculate Kp. The basic thermal physical parameters are obtained in the laboratory.

38×10−23 J/K, Pm is the mean total pressure within the pores in adsorbent (Pa), and T is the absolute temperature (K). 07 μm, while under vacuum conditions, the mean free path for air may be several microns to several meters. Obviously, operating conditions have a great influence on diffusion mechanisms. 7 Diffusion mechanisms for gases in pores. 75) where dp is pore diameter (m). , the pore size is large in relation to the mean free path of gas molecules, the molecule-molecule collisions between gas molecules themselves will dominate and viscous Poisseuille flow will occur.

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