By Arun S. Mujumdar
By a long way the main usually encountered and energy-intensive unit operation in just about all business sectors, commercial drying keeps to draw the curiosity of scientists, researchers, and engineers. The Handbook of commercial Drying, Fourth Edition not just grants a accomplished remedy of the present state-of-the-art, but additionally serves as a consultative reference for streamlining commercial drying operations.
New to the Fourth Edition:
- Computational fluid dynamic simulation
- Solar, impingement, and pulse combustion drying
- Drying of end result, greens, sugar, biomass, and coal
- Physicochemical elements of sludge drying
- Life-cycle evaluate of drying systems
Covering usually encountered dryers in addition to cutting edge dryers with destiny capability, the Handbook of business Drying, Fourth variation not in basic terms information the most recent advancements within the box, but additionally explains how advancements in dryer layout and operation can raise strength potency and cost-effectiveness.
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Extra info for Handbook of Industrial Drying, Fourth Edition
2 Typical enthalpy–temperature diagram for a pure substance. temperature. 8) where the heat flow Q is the sum of the internal energy change ∂u and the work done against pressure P ∂V. 10) 1 Second-order polynomials in temperature have been found to adequately describe the variation of CP with temperature in the temperature range 300–1500 K , but for the temperature changes normally occurring in drying the quadratic term can be neglected. 12) The mean heat capacity is the heat capacity evaluated at the arithmetic mean temperature Tav.
41 and thus the adiabatic saturation temperature is the same as the wet bulb temperature for the air–water system. For systems other than air–water, they are not the same, as can be seen from the psychrometric charts given by Perry . It is worthwhile pointing out here that, although the adiabatic saturation curve equation does not reveal anything of the enthalpy–humidity path of either the liquid phase or gas phase at various points in the contacting device (except for the air–water vapor system), each point within the system must conform with the wet bulb relation, which requires that the heat transferred be exactly consumed as latent heat of vaporization of the mass of liquid evaporated.
These problems could be alleviated by using sulfuric acid– water mixtures and saturated salt solutions to obtain different relative humidities [10,13]. 13 depicts the absorption isotherms of a range of food products. Further information on solid moisture characteristics, enthalpy of wetting, and sorption isotherms are available in Refs. [3,10]. 4 Mechanism of Drying As mentioned above, moisture in a solid may be either unbound or bound. There are two methods of removing unbound moisture: evaporation and vaporization.