The authors experimentally observed the pressure flow of non-Newtonian fluids between eccentric double cylinders with the inner cylinder rotating. Experiments were carried out to measure the pressure gradient, the angle of the secondary flow region and the pressure distribution on the outer cylinder using aqueous solutions of hydroxy ethyl cellulose (HEC:). Results are summarized as follows:
1) Axial flow rate was enhanced by the rotation of inner cylinder. Denote the axial flow rate Q_s; and Q_r; respectively with the inner cylinder stationary and rotating. Then the larger was the difference between Q_s; and Q_r; the larger was the effect of eccentricity.
2) The angle of the secondary flow region increased with decreasing number of inner cylinder rotation and increasing axial pressure gradient.
3) Distribution of pressure on outer cylinder was affected by the axial flow rate, radius ratio and eccentricity.
4) Experimental results agreed well with numerical predictions. Thus the reliability of the numerical method used in the previous paper was confirmed.

View full abstract

Since the objective specification of the fabric hand, mechanical properties and making up appearance of suits have been studied by The Hand Evaluation and Standardization Committee of our Society, a trial has been made to control the fabric hand and quality by objective mesurements in fabric makers.
As an example of this trial, this paper shows a design of a mohair blended fabric as follows:
1) The relation between the product condition from fiber to finishing and the mechanical properties is investigated.
(2) The characteristics of the highly ranked mohair blended fabric is shown by mechanical properties.
(3) A good mohair fabric is designed to control product conditions based on mechanical properties.

View full abstract

As the FRP is superior in the corrosin resistance and is more inexpensive in material cost than corrosion resistant metallics, recently it is widely used for large diameter piping material.
Tojoin the FRP piping of large diameter, a double lap joint is generally used, in which the secondary adhesion is applied on both inner and outer surface. Until now it is empirically said that the design water velocity is 3m/s and critical water velocity is 6-10m/s with regard to the peeling-off of the second adhesion part laminated inner face produced by water flow. But the piping for sewer and water-conveyance that has been used until now is flat with low water velocity and low water head. The process piping of large diameter is provided with bends, branches, pipes with head, control calves and heaters in the piping system. The pressure, velocity and temperature vary greatly in the pipe. Therefore, it is necessary to consider whether the values on the basis of former experiment are suitable for the process piping. The purpose of this report is to make clear the basis of the peeling-off limit in the former experiences. In this report of part I, the experiment of the peeling-off by the water jet is shown. This experiment is concerned with the forming factor and selection of material, disregarding the secular deterioration of resin. In the next report (Part 2), the same experiment on the secular detrioration of resin will be shown. The mechanism of peeling-off by water flow will also be considered. Further a new method of the second adhesion joint which will prevent the occurence of the peeling-off will be proposed.

View full abstract