The authors have proposed a method to evaluate the parameters in the Wilson equation from Q function, and have prepared charts necessary for the method. Using these charts, precise parameters can be determined without difficulty.
Applying the proposed procedure to benzene-ethanol (positive deviation) and acetone-chloroform (negative deviation) binary systems, we have determined the parameters which are sufficiently close to those obtained by more rigourous methods

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In order to clear the flow mechanism of the foaming layer on a tray without downcomer, the liquid hold-up on a perforated plate were considered theoretically and experimentally. From the correlation between tray shapes, gas and liquid rates, physical properties of both fluid and pressure drop of gas through the foaming layer, a theoret ical equation for the liquid hold-up on a perforated plate was derived. And also, some coefficients in this equation were determined by the experiment of water-air system

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Boiling heat transfer coefficients on a horizontal copper plate and a platinum wire were measured experimentally for five pure liquids and ten liquid mixtures. These liquids were water, methanol, ethanol, acetone, methylethylketone and these binary water solutions (3, 10, 50mol% MeOH H₂O; 3, 10, 50mol% EtOH-H₂O; 3, 50mol% Acetone-H₂0; 3, 50mol% MEK-H₂O).
All these experimental date were correlated by an equation derived from dimensional analysis. It was found that this equation was in good agreement with the other data of pure liquids and binary liquid mixtures on several heating surfaces (Cu-plate, Cr-plate, Brass pipe, Pt-wire)

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For countercurrent flow and solute transfer between continuous phase and drop population of size distribution. the mathematical model was proposed and computation was performed based on the informations in toluene-water system.
The distributions of mass transfer coefficient, interfacial area per unit volume and contacting time of droplet result from the size distribution, but contacting time distribution is a potent influence in the same degree as the interfacial area.
If the dimensionless variance of size distribution is 1ess than about 0.03, a drop population can be treated as one of uniform size.

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The double-tube bubble column is one of the gas-liquid contacting apparatus consisting of two concentric vertical tubes. The absorbing liquid in the inner tube flows up concurrently with bubbles, and circulates down through the annular section between the inner and the outer tubes.
The apparatus was tested for chlorination of benzene catalyzed by ferric chloride, under the condition of varying gas concentration, catalyst concentration and others.
Theoretical equations on solute concentration and mass transfer rate were derived, by assuming that chemical absorption by liquid containing the solute takes place during the time when liquid contacts with the bubble, and the solute simply reacts with the liquid except that duration of the time.
Experimental values on chlorine concentration in benzene fairly coincide with theoretical ones.

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The length of liquid sheet from a fan nozzle and its fluctuation were observed by taking numerous strobo photographs. The distribution of sheet length was Gaussian one, and its variance was very small as compared with the variance of drop size distribution. Therefore, we concluded that the broad distribution of drop size should not be due to the fluctuation of liquid sheet length from the fan nozzle.

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In order tc, afford a basic mathematical tool for the socalled filter-thickening operation, the critical tractive condition for particulate beds under permeation is studied.
On the basis of kinetics for a particle in the uppermost layer of beds, the critical tractive equation is derived in terms of the particle diameter d_p, its density ρ_p, the liquid characteristics and the exposure factor ψ which is the ratio of the projected area of the exposed surface to main flow to that of the particle.
Experiments were executed by using three kinds of materials forming beds. Reasonable coincidence between the theory and experiments are obtained.

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It is considered that the convective flow mixing in a vessel is achieved by circulation flow, which is caused by the impeller rotation. This convective flow mixing can be characterized by circulation time distribution which is measured on the basis of a measuring plane in a vessel.
From this point of view, the circulation time distribution of viscous liquid was measured with the use of a small tracer particle. Three types of impellers, helical ribbon type impeller, anchor type impeller and helical screw type impeller with a draught tube were used in the experiments. It was found that the circulation time distribution function can be reprseented by the sum of two mathematical function, i. e. trigonometrical and exponential functions, according to the flow patterns in a vessel. The shape of the distribution function depends on the shape of impeller, viscosity of liquid and speed of revolution.

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In the Wilson, Heil, and NRTL equations, the mutual relationship among three set of energy parameters obtained from binary systems which compose a ternary system is discussed.
Numerical results are presented concerning the effect of the temperature on the nonrandomness constant α₁₂.

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