By J.M.P.Q. Delgado, A. Gilson Barbosa de Lima
This booklet presents a complete evaluate of crucial issues concerning traditional and complex drying and effort applied sciences, specifically stimulated through elevated and educational interest.
The major subject matters mentioned are: idea and purposes of drying, rising subject matters in drying technology, innovations and developments in drying, thermo-hydro-chemical-mechanical behaviors of porous fabrics in drying, and drying apparatus and effort. because the subject matters coated are inter-and multi-disciplinary, the e-book bargains a superb resource of data for engineers, strength experts, scientists, researchers, graduate scholars, and leaders of business companies.
This booklet is split into numerous chapters concentrating on the engineering, technological know-how and expertise utilized in crucial business tactics used for uncooked fabrics and products.
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Example text
Chua et al. [13] show some ways to implement the intermittent drying process: (a) Intermittent drying whereby heat flux is supplied intermittently rather than continuously. This can be done by interrupting the air flow to provide the material a ‘‘rest’’ or ‘‘tempering’’ period, by a continuous air flow periodically heated, or by periodic variation of air flow or by combination of both; (b) Aeration which is a drying process involving a combination of high temperature short drying period, tempering, and slow cooling followed by drying; (c) Air reversal drying which is reversing the direction of the airflow for a period of time and then returns it to its original direction.
This way the shape of the element is unchanged. The body is unrestrained (free to expand and constrains). • Because no shear stress occurs, the stresses (σx, σy and σz) are the principal stresses (maximum normal stress in each location in the brick). According to these considerations, the total stress inside the brick is the sum of hygro and thermal stresses. So, by using Eq. (22), the normal stress in the x, y and z directions can be calculated using the following equations: Clay Products Convective Drying … 53 Fig.
The results of the drying studies presented for Kowalski and Pawłowski [30] allows to state that the intermittent drying can be recommended above all to drying of materials, which have a tendency to cracking during drying as, for example, ceramics and wood. Through changes of drying conditions in the pre-established instants one can avoid material fracture and thus preserve a good quality of dried products. The authors have stated that intermittent drying positively influences the quality of the dried materials without significant extension of the drying time.