The Effect of Changes in the Equilibrium Relative Vapor Pressure Upon the Capillary Structure of Wood
- 1 October 1935
- journal article
- research article
- Published by AIP Publishing in Physics
- Vol. 6 (10), 334-342
- https://doi.org/10.1063/1.1745274
Abstract
Measurements have been made of the equilibrium permeabilities of softwoods to air of different relative vapor pressures. Transverse sections less than the average fiber length in thickness, in which the open cavities account for practically all of the permeability, show practically no change in permeability with changes in the equilibrium relative vapor pressure. Sections thicker than the maximum fiber length, the permeabilities of which are dependent upon the size of the pit openings, show an increase in permeability with a decrease in equilibrium relative vapor pressure. When the square root of the permeability is plotted against the moisture content of the wood in equilibrium with the various relative vapor pressures of air, practically a linear relationship is obtained from 0 to 20 percent moisture content. At higher moisture contents the permeabilities are considerably less than the linear relationship calls for. This is due to films of water forming across the capillaries. Higher pressures than those used are required to overcome the effect of the surface tension of the water in these capillaries. A new means of determining the distribution of size of openings in a porous membrane based on these findings is given.Keywords
This publication has 10 references indexed in Scilit:
- SHRINKING and SWELLING of WOODIndustrial & Engineering Chemistry, 1935
- Adsorption Compression on Cellulose and Wood. I. Density Measurements in BenzeneThe Journal of Physical Chemistry, 1935
- A Study of Certain Factors Influencing the Movement of Liquids in WoodThe Journal of Physical Chemistry, 1935
- FURTHER INVESTIGATION OF THE PENETRATION OF LIQUIDS INTO WOODCanadian Journal of Research, 1934
- Mikrophotographische Quellungsuntersuchungen von Fichten- und Buchenholz an Mikrotomschnitten im durchfallenden Licht und an Holzklötzchen im auffallenden LichtColloid and Polymer Science, 1933
- 17—EFFECT OF ATMOSPHERIC HUMIDITY AND TEMPERATURE ON THE RELATION BETWEEN MOISTURE CONTENT AND ELECTRICAL CONDUCTIVITY OF COTTONJournal of the Textile Institute Transactions, 1933
- An Electrical Conductivity Method for determining the Effective Capillary Dimensions of WoodThe Journal of Physical Chemistry, 1932
- THREE METHODS OF STUDYING CAPILLARY STRUCTURE AS APPLIED TO WOODPhysics, 1931
- PENETRATION STUDIES THE PATH OF LIQUID PENETRATION IN JACK PINECanadian Journal of Research, 1930
- THE SIZE OF PORES IN COLLODION MEMBRANESThe Journal of general physiology, 1926