| |
 |
|
|
| Avtorstvo: |
Jana ŠELIH // 1.08 Objavljeno predavanje na znanstveni konferenci
|
| Leto: |
1995 |
| Citat: |
ŠELIH, Jana, SOUSA, Antonio C. M., BREMNER, Theodore W. Mass and heat
transfer in concrete exposed to drying. V: BILGEN, E. (ur.). Proceedings
ITEC 95. Vol. 2. Montreal: the Organizing Committee of the Congress,
1995, str. 526-531. |
| Povzetek: |
Moisture content and temperature changes during
drying were investigated in the present work. Particular emphasis was placed
on the initial stage of drying of saturated concrete, where moisture
contents are high. For this stage of drying, experimental data are lacking,
and no comprehensive theory exist to describe it. The present investigation
was performed experimentally and numerically for drying of cylinders of
different lengths with one exposed end, and made of lightweight concrete.
Large, constant drying rates, and energy changes associated with the
evaporation of the free liquid water were observed both experimentally and
numerically in the initial stage of drying. The numerical model developed is
based on a generalized mathematical formulation for mass and heat transfer
in porous media, and its predictions are in good agreement with the
experimental data within the uncertainty range of the input data
Članek obravnava spreminjanje vsebnosti vode in temperatur v betonu med
sušenjem. Poudarek je na prvi fazi sušenja, kjer so vsebnosti vode visoke,
saj za to fazo v razpoložljivi literaturi manjka podatkov. Opisana preiskava
je potekala na betonskih valjih različnih dolžin, ki so bili izpostavljeni
sušenju na enem koncu. Kot material smo uporabili navaden in lahkozrnat
beton, poleg eksperimentalnega preskušanja pa smo izvedli tudi numerično
simulacijo sušenja. Tako eksperimentalno kot numerično smo ugotovili, da so
v zgodnji fazi hitrosti sušenja velike, zaradi faznega prehoda porne vode pa
pride do energetskih sprememb v poroznem materialu. Uporabljeni numerični
model temelji na posplošeni matematični formulaciji kombiniranega snovnega
in toplotnega pretoka v poroznih materialih, in rezultati simulacije se
ujemajo z eksperimentalno dobljenimi vrednostmi znotraj inervala negotovosti
vhodnih podatkov |
| Tipologija: |
1.08 Objavljeno predavanje na znanstveni konferenci |
| COBISS ID |
124775 Polni zapis iz sistema COBISS |
|
Vpisal 2001/08/08 19:56
|
|
