Characterization of the first falling rate period during drying of a porous material

被引：48

作者：

Belhamri, A ^{[1
]}

机构：

[1] Univ Mentouri Constantine, Dept Genie Climat, Fac Sci Ingn, Constantine 25000, Algeria

来源：

DRYING TECHNOLOGY | 2003年 / 21卷 / 07期

关键词：

diffusion model; evaporation front; surface saturation; surface temperature; porous media; brick;

D O I：

10.1081/DRT-120023178

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

This study deals with the evolution of the surface state and its influence on the drying of porous media. Surface temperature and saturation values are obtained using optical metrology. Analysis of the experimental results allows discussion of the apparition of constant drying rate period and to characterize the transition to the falling rate period. A mathematical model is developed to account for these observations and experimental results for some physical properties of a model material. It allows determination of the internal profile of moisture and the penetration of the drying front during the falling rate period.

引用

页码：1235 / 1252

页数：18

共 25 条

[1] Heat and mass transfer along a wetted porous plate in an air stream [J].

Belhamri, A ;

Fohr, JP .

AICHE JOURNAL, 1996, 42 (07) :1833-1843

[2] Effect of the variability of heat and mass transfer coefficients on convective and convective-radiative drying of porous media [J].

Boukadida, N ;

Ben Nasrallah, S .

DRYING TECHNOLOGY, 2002, 20 (01) :67-91

[3]

CHEN P, 1989, INT J HEAT MASS TRAN, V30, P297

[4]

Comings E. W., 1983, DRYING TECHNOLOGY, V2, P117

[5]

Eckert ERG, 1972, ANAL HEAT MASS TRANS

[6]

ELHAMRI A, 1992, DRYING 9I, P353

[7] FUNICULAR STATE IN DRYING OF A POROUS SLAB [J].

KAVIANY, M ;

MITTAL, M .

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 1987, 30 (07) :1407-1418

[8]

Keey R.B., 1992, DRYING LOOSE PARTICU

[9]

KORKIDA MK, 2002, DRYING TECHNOLOGY, V20, P1

[10] MECHANISM OF DRYING THICK POROUS BODIES DURING THE FALLING RATE PERIOD .1. THE PSEUDO-WET-BULB TEMPERATURE [J].

NISSAN, AH ;

KAYE, WG ;

BELL, JR .

AICHE JOURNAL, 1959, 5 (01) :103-110

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