Influence Of Physical Properties Research Articles

Ozone Fading of Disperse Blue 3 on Nylon 6 Fibers. The Influence of Physical Fiber Properties

Based on the diffusion concept of the dyestuff molecule, a model is presented to account for the influence of the physical properties of nylon 6 fibers on the ozone-fading phenomenon. To develop the model, a special series of fibers was made using widely different cross sectional shapes and texturing conditions. The fibers were dyed in a bath containing Disperse Blue 3 as the ozone-fading sensitive dyestuff. In order to study situations closely related to practice, we confined our selves to carpet yarn like types of fiber, both before and after steam heat-setting. Fitting of a mathematical model, relating structural parameters to ozone fading, showed that the molecular porosity of the structure and the specific area of the surface are the main factors involved. The contribution of the orientation did not turn out to be significant in our model. Another series, containing yarns from a considerable variety of bulking processes and producers, was analyzed in the same way to check the applicability of the model Although a rather good fit was found for most samples, some dis crepancies remained. Suggestions are given for the interpretation of these deviations.

Calculation of minimum ignition energy and time dependent laminar flame profiles

Unsteady-state laminar flame theory is used to predict minimum ignition energies for hydrazine vapor and to follow flame speed, temperature profiles, and concentration profiles from ignition by spherical or elongated hot pockets to steady propagation of spherical flames. The time-dependent flame equations are solved in prolate spheroidal coordinates using a Crank-Nicolson predictor-corrector method with step size control. It is shown that the minimum ignition energy is influenced by the geometry of the ignition source and that the ignition energy passes through an absolute minimum as a function of the radius of the spark. Steady flame speeds are compared with experimental values and with the predictions of other workers; and the influence of physical properties, reaction chemistry, and kinetics on the steady flame speed is examined.

Influence des propriétés physiques sur le transfert de matiére en fluidisation liquide

The influence of physical properties on the mass transfer between the liquid and the solid particles in a fluidized bed has been investigated. The experiments concern benzoïc acid particles dissolved in water under various conditions. Results show that the Sherwood number is proportional to the product Sc 0,44 M v 0,38 of the Schmidt and density numbers.

The Influence of Physical Properties on Penetration in Arc Welding

Simple butt welds were produced using a particular metal and a variety of combinations of current, voltage, and welding velocity. Four metals possessing quite different physical properties were utilized. Coated stick electrodes and a d-c power source were employed and penetration was measured for each combination of work material and welding conditions. With the use of dimensional analysis, an expression was derived to predict penetration as a function of operating conditions and the physical properties of the metal welded. Within the range of variables investigated, the correlation between predicted values and measured values was quite reasonable.

Closure to “Discussion of ‘The Influence of Physical Properties on Machinability’” (1963, ASME J. Eng. Ind., 85, pp. 327–328)

Closure to “Discussion of ‘The Influence of Physical Properties on Machinability’” (1963, ASME J. Eng. Ind., 85, pp. 327–328)

The Influence of Physical Properties on Machinability

This paper is the result of an analytical and experimental study of the effect of the physical properties of a material on its machinability. The physical properties studied were: the total stress-strain relations; the hardness; the microstructure; the abrasiveness; the thermal properties. A variety of ferrous and nonferrous materials were selected with a large range of the physical properties. A relationship is derived by means of which it is possible to calculate the culling speed for a given tool life from the physical properties of the work material.

Influence of physical properties of glaze on the quality of a glazed surface

Influence of physical properties of glaze on the quality of a glazed surface

12) 保温材に關する研究(1) : 圓筒法による保温材の傳熱導率測定法並びに線状纎維質保温材と粒状保温材の熱傳導率に及ぼす物理的性質に關する考察について

12) 保温材に關する研究(1) : 圓筒法による保温材の傳熱導率測定法並びに線状纎維質保温材と粒状保温材の熱傳導率に及ぼす物理的性質に關する考察について

Influence of Physical Properties of Carbon Black on Its Tinting Strength

Abstract 1—Tinting strength is not an absolute function of particle. 2—No direct ratio exists between tinting strength and hiding power. 3—The thickness of the film of adsorbed gases on the carbon-black particles determines the tinting characteristics. 4—The volatile matter present and the oil-absorption properties serve as a measure of the relative thickness of such films. 5—The completeness with which these gases are displaced materially affects the tinting strength. 6—Complete displacement is only possible when the inter-facial tension produced by the dispersing medium at the surface of the carbon-black particle is sufficiently low to assure complete wetting.