A new model is proposed for the drying process in capillary-porous solids during the period of falling drying rate. Good agreement is obtained between the theoretical calculations and the experimental results.
Int. J. Heat Mass Transfer. Vol. 20, pp. 451-458. Pergamon Press 1977. Printed in Great Britain INTENSIVE DRYING OF AN INFINITE PLATE G. TRIPATHI, K. N. SHUKLA* and R. N. PANDEY Institute of Technology, Banaras Hindu University, Varanasi, India Received 30 September 1975 Abstractinetics of drying mechanism is studied for the capillary porous body.
The onset of drying of a porous particle bed immersed in saturated water and heated with a high surface heat flux is investigated. Heating of the top surface of the porous particle bed while the bottom surface is immersed in a bulk liquid induces a decrease in the local liquid saturation due to evaporation and the liquid flow toward the heated surface due to capillary action.
Experimental evidence of mass transfer mechanisms during freeze-drying in a capillary porous medium Article in International Journal of Refrigeration 35 8 :2102–2109 · December 2012 with 87 Reads
Prat, M.: 1995, Isothermal drying of non-hygroscopic capillary-porous materials as an invasion percolation process, Int. J. Multiphase Flow 21, 875–892. CrossRef Google Scholar Prat, M. and Bouleux, F.: 1999, Drying of capillary porous media with a stabilized front in two dimensions, Phys. Rev. E 60 , 5647–5656.
12. D. Berger and D. C. T. Pei, Drying of hygroscopic capil- lary porous solids theoretical approach. Int. J. Heat Mass Transfer 16, 293-302 1973 . 13. A. V. Luikov, Heat and Mass Transfer in Capillary- porous Bodies. Pergamon Press, London 1966 . 14. A. V. Luikov, Systems of differential equations of heat and mass transfer in capillary ...
Soft porous solids can change their shapes by absorbing liquids via capillarity. Such poro-elasto-capillary interactions can be seen in the wrinkling of paper, swelling of cellulose sponges, and morphing of resurrection plants. Here, we introduce physical principles relevant to the phenomena and survey recent advances in the understanding of swelling and shrinkage of bulk soft porous media due ...
1. Introduction. Capillary water ingress in cementitious materials is a widely used transport mechanism to describe durability. From standardized tests, the sorptivity parameter is obtained and it can be useful to describe the pore connectivity of cementitious materials.
This review examines the stages of drying, with the emphasis on the constant rate period CRP , when the pores are full of liquid. It is during the CRP that most of the shrinkage occurs and the drying stresses rise to a maximum. We examine the forces that produce shrinkage and the mechanisms responsible for transport of liquid.
A drying model for three-dimensional shrinking bodies. ... Drying in capillary-porous cylindrical media. ... Physical Mechanisms During the Drying of a Porous Medium. ...
The ink moves from a reservoir in the body of the pen down to the tip and into the paper which is composed of tiny paper fibers and air spaces between them , and not just turning into a blob. Of course gravity is responsible for the ink moving "downhill" to the pen tip, but capillary action is needed to keep the ink flowing onto the paper.
276 On modelling the drying of porous materials diﬀerential equations separately without paying attention to the coupling eﬀects, espe-cially when the drying rates are small see, e.g., 3 . However, one would expect that these coupled heat and mass transfer in porous bodies could be expressed mathemati-
the mechanism of internal moisture movement. Although it is now accepted that in most practical situations of air drying of foods the principal rate-determining step is internal mass transfer, there is no agreement on the mechanism of internal moisture movement. In the case of capillary-porous materials such as fruits and
capillary-porous coating is important. The limiting condition of structure can be studied by solution of thermal elasticity problem. A model of the nucleation of steam bubbles in the cells of the capillary-porous struc-ture is developed in our study. The model of development of a vapor phase in the porous coat-
The complex capillary structure of a porous body may be the cause of capillary hysteresis, that is, the dependence of the quantity of liquid condensed in the pores not only on vapor pressure but also on the prehistory of the process, that is, how the given state was attained—by the condensation or by the evaporation of the liquid.
Vycor porous glass has long served as a model mesoporous material. During the physical adsorption of halogenated hydrocarbon vapours, such as dibromomethane, the adsorption isotherm exhibits an ...