By R. B. Keey and P. V. Danckwerts (Auth.)
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Extra info for Drying. Principles and Practice, Edition: 1st
Sorption data for twelve wood species are recorded by Hedlin(27) at subzero temperature down to — 16°C. Data at steam temperatures are useful in interpreting the drying of many hygroscopic products. (28) Some extrapolated data for the equilibrium-moisture content of pinewood above Equilibrium moisture content FIG. 6. Moisture isotherms for various substances mainly at room temperature. 1. Asbestos fibre. 2. Polyvinyl chloride powder (50°C). 3. Wood charcoal. 4. Kraft paper. 5. Jute. 6. Wheat. 7.
Where AL is the area of the holes filled with liquid in unit cross-section of the material. This area is found from the pore-size distribution r AL J nr2 dr -j- dr. 27) Whenever the moisture content is less than Xmax, SLIT must be present within the body. For experimental purposes, it is often more convenient to use a bed of closely graded spherules, rather than a cylindrical system. Spheres pack down in a number of ways. Drying: Principles and Practice 36 Cubic packing gives the least close arrangement and hexagonal the closest.
31) 14 Drying: Principles and Practice Values of a and gvare estimated from fuel analyses; the water vapour gvarises from both the moisture associated with the fuel and the hydrogen content of the latter. For very rough estimates Krischer(7) gives the following values for the mass change on combustion (gG— gA): + 0-5 kg/kg for solid fuels; no change for fuel-oils; —0-8 kg/kg for hydrogen-rich gases; and +0-8 kg/kg for hydrogen-lean gases. 33) YG~YA+gv/gG. The energy balance for burning unit mass of fuel is given by Ho+AH0+gAiGA = gGiGG+aHsa.