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capillary porous bodies intensive drying mechanism

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Tracking time with ricequakes in partially soaked brittle ...

(21, 22) under gravity, the upward wetting of porous media is carried out by micropores that reside within the particles (as they undertake larger surface tension), and thus, l m also controls the upward capillary pull up of fluid through the capillary gravity length ( 23) L G ¼ g l mgr ð1Þ

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Drying mechanism of capillary-porous bodies | SpringerLink

Abstract. 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.

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Heat and Mass Transfer in Capillary-Porous Bodies ...

This chapter discusses the basic properties of capillary-porous bodies. The presence of water in a material affects in different ways its principal properties and, first of all, its mechanical properties. This phenomenon is determined by the type of bonding between water and the capillary-porous body.

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Modelling Drying Shrinkage in Reconstructed Porous ...

The internal forces in a porous medium come from the negative pressure in the capillary water, which acts on the solid surfaces with which it is in contact, and the changes in the specific surface energy in the adsorbed water layers.

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Intensive drying of an infinite plate - ScienceDirect

Kinetics of drying mechanism is studied for the capillary porous body. Local values of temperature, moisture content and pressure are evaluated analytically under the most general type of …

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Drying in Deformable Partially-Saturated Porous Media: Sol ...

The capillary pressure within the pore liquid causes the coating to shrink, the pores to constrict, and the solid skeleton to deform from its ... 3, Theory of Drying Deformable Porous Coatings ... we treat the gel as a porous body with a distribution of pore sizes and assume that the solvent in …

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Tracking time with ricequakes in partially soaked brittle ...

Specifically, dry cornstarch, carbomer, and silicone have been used to demonstrate transient deformations in correspondingly brittle, semibrittle, and ductile crustal rocks, while cereal (puffed rice) has been used to reveal previously hidden propagating compaction patterns in dry porous media (8–10).

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Liquid and vapor flows in porous bodies : surface phenomena

An approach to the study and processes of mass transfer, this text takes into account the heterogeneous dispersal state of porous bodies. It bases the discussion on the theory of surface forces and Read more...

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Drying mechanism of capillary-porous bodies

Abstract 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.

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Chapter 5 Multiphase Pore Fluid Distribution - Rice University

Chapter 5 Multiphase Pore Fluid Distribution. Reading assignment: Chapter 3 in L. W. Lake, Enhanced Oil Recovery. So far we have discussed rock properties without regard to the fluid other than that it was a single phase. When multiple phases exist in a rock or soil we need to be concerned about how the fluids are distributed in the pore space and

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A numerical study on drying of porous media

A numerical study on drying of porous media Nima Amanifard and Akbar Khodaparast Haghi† The University of Guilan, Faculty of Eng., P. O. Box 3756, Rasht, Iran (Received 13 March 2007 • accepted 5 July 2007) Abstract−In this study, two-dimensional conjugate heat and mass transfer in porous body and drying air during the

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Capillary action - Wikipedia

Capillary action (sometimes capillarity, capillary motion, capillary effect, or wicking) is the ability of a liquid to flow in narrow spaces without the assistance of, …

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Setting up the drying regimes based on the theory of ...

7]. The facts that capillary flow is predominant mechanism within the constant drying period, while in the falling drying period, the evaporation – condensation and vapor diffusion are the predominant mechanisms, has wan general recognition for the explanation . of moisture transfer in porous media.

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OSTI.GOV Technical Report: Advanced Energy and Water ...

Experimental study revealed condensation and convection through the porous membrane bundle was greatly improved over an impermeable tube bundle, because of the membrane capillary condensation mechanism and the continuous evacuation of the condensate film or …

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A STUDY OF VAPOR-LIQUID FLOW IN POROUS MEDIA

the pore body (Figure IC ) and the growth process continues to completely fill the entire pore body (Figure Id). Following nucleation, growth of the bubble contin- ues until the pore body is completely filled with vapor phase. When this is completed, bubble can- not grow because of the capillary …

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Solutions of Luikov equations of heat and mass transfer in ...

Kinetics of drying mechanism is studied for the capillary porous body. Local values of temperature, moisture content and pressure are evaluated analytically under the most general type of boundary ...

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Wood drying - Wikipedia

These are discussed here, including capillary action, which is a mechanism for free water transport in permeable softwoods. Total pressure difference is the driving force during wood vacuum drying. Capillary action. Capillary forces determine the movements (or absence of movement) of free water. It is due to both adhesion and cohesion.

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Change in the structure of colloidal capillary-porous ...

We suggest a complex procedure for investigating shrinkage stresses in the process of drying colloidal capillary-porous bodies. Different stages of structure formation in the process of heat and mass transfer are studied. The physical mechanism of shrinkage phenomena is considered.

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Predicting efflorescence and subflorescences of salts ...

Crystallization of salts is a common cause of damage in porous building materials. Understanding of the crystallization mechanism of salts is important in order to prevent or avoid the problem.

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Influence of Irradiation Time, Particle Sizes, and Initial ...

Ratanadecho PP, Aoki KK, Akahori MM. Influence of Irradiation Time, Particle Sizes, and Initial Moisture Content During Microwave Drying of Multi-Layered Capillary Porous Materials.

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Research Article Heat and Mass Transfer with Condensation ...

e purpose of this present work is related to wetting process analysis caused by condensation phenomena in capillary porous material by using a numerical simulation. Special emphasis is given to the study of the mechanism involved and the evaluation of classical theoretical models used …

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Drying mechanism of capillary-porous bodies - Springer

DRYING MECHANISM OF CAPILLARY-POROUS BODIES R. Toe[ and M. Okazaki UDC 66.047 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 …

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Verification of Roof snap off as a foam ... - DeepDyve

Importantly, snap off is shown to be the dominant mechanism for generation of a discontinuous gas phase within this porous medium. Experiments are conducted under steady flow conditions in a relatively dry porous medium at significant capillary pressure.

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3. Drying and binder removal

3. Drying and binder removal 3.0 Introduction Drying = elimination of free and adsorbed water (including capillary water) from the as-shaped ceramic green body; mathematical modeling: heat transfer and mass transport. Binder removal or debinding, i.e. the elimination of organic binders and additives, in the prefiring stage, is a similar process.

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A study of thermal drying process - NISCAIR

performance of various drying process in materials having diverse moisture transport properties7. In drying of wet porous materials, internal liquid moisture transport is mainly by capillary flow and vapour diffusion8. The drying of solids is usually taken as removal …

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Drying Curves | Adsorption | Evaporation

Moisture is simply trapped between the particles. A capillary-porous material may be nonhygroscopic: that is. Some of these may be described as being both capillary-porous and colloidal. composed of a matrix colloidal by nature but developing a pore structure upon drying.

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High Intensity Drying in Porous Materials | Journal of ...

High intensity drying is used to characterize those situations for which the drying medium is sufficiently above the saturation temperature of water to preclude the existence of a two-phase zone. In the present work, three models are applied to high intensity drying of porous materials.

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Numerical Simulation of Vacuum Drying by Luikov's ...

A two-dimensional mathematical model was developed to simulate coupled heat and mass transfer in apple under vacuum drying. Luikov's equations are the governing equations in analyzing heat and mass diffusion problems for capillary-porous bodies.

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Drying of Porous Materials - Home - Springer

Drying of Porous Materials 7.1 Introduction Drying is the process of thermally removing volatile substances (e.g., moisture) to yield a solid product. Mechanical methods for separating a liquid from a solid are not considered drying. When a wet solid is subjected to thermal

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Capillary Bridges and Capillary-Bridge Forces - uni-sofia.bg

470 Chapter 11 11.1. ROLE OF THE CAPILLARY BRIDGES IN VARIOUS PROCESSES AND PHENOMENA McFarlane and Tabor [1] studied experimentally the adhesion of spherical beads to a flat plate. They established that in clean dry air the adhesion was negligible.

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Ch. 25 Final Questions and Study Guide | Quizlet ...

Thirst mechanism is the driving force for water intake The hypothalamic thirst center osmoreceptors are stimulated by Plasma osmolality of 2-3% Angiotensin II or baroreceptor input Dry mouth Substantial decrease in blood volume or pressure

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DRYING - Thermopedia

If the openings form a capillary network, the material is said to be capillary-porous. A capillary-porous material may be nonhygroscopic: that is, the moisture held within the body exerts its full vapor pressure. This is a limiting case found in some coarse, nonporous mineral aggregates.

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