By Ashim K. Datta
Providing a beginning in warmth and mass delivery, this booklet covers engineering ideas of warmth and mass move. the writer discusses organic content material, context, and parameter regimes and offers useful functions for organic and biomedical engineering, commercial nutrition processing, environmental keep an eye on, and waste administration. The e-book includes end-of-chapter difficulties and sections highlighting key options and critical terminology It deals cross-references for simple entry to comparable parts and correct formulation, in addition to targeted examples of shipping phenomena, and outlines of actual methods. It covers mechanisms of diffusion, capillarity, convection, and dispersion.
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Extra resources for Biological and Bioenvironmental Heat and Mass Transfer
2: Range of thermal conductivity values (at normal temperature and pressure) for various materials compared with those for biomaterials. Adapted from Fundamentals of Heat and Mass Transfer by F. P. Incropera and D. P. DeWitt, c 1990 John Wiley & Sons, Inc. Reprinted by permission of John Wiley & Sons, Inc. material is associated with the energy of the molecules around that location. Higher temperature corresponds to higher molecular energy. In a gas, this energy can be translational, rotational or vibrational.
MODES OF HEAT TRANSFER and pores together). The porosity of a material is defined as the volume of pores occupied by air and water (if present) divided by the total volume of the solid. g. fluid flow over a surface). 7. Forced convection is due to an external force such as a fan, while free or natural convection is driven by a density difference in the material. 10) where q1−2 is the heat flow rate from 1-2 (in W or Btu/hr), A is the area normal to the direction of heat flow (m2 or ft2 ), T1 − T2 is the temperature difference between surface and fluid, and h is the convective heat transfer coefficient, also called the film coefficient.
10) where q1−2 is the heat flow rate from 1-2 (in W or Btu/hr), A is the area normal to the direction of heat flow (m2 or ft2 ), T1 − T2 is the temperature difference between surface and fluid, and h is the convective heat transfer coefficient, also called the film coefficient. 10 is not a law but a defining equation for h. It is important to note that the convective heat transfer coefficient h always includes the effect of conduction in the fluid, in addition to its bulk flow. The effect of conduction, which is a random molecular effect, is always there, in the presence or absence of bulk flow and it cannot be stopped.