Toshio Kawashima

Pressure Loss of Pseudo-Plastic Fluid Flow in Pipes

In order to predict both the velocity profile and the relationship between friction factor and Reynolds number for pseudo-plastic fluids flow in smooth pipes, and improved mixing-length distribution is proposed in this paper. This distribution is a modification of Van Driests model for Newtonian fluids flow obtained by referring to the results of the other researchers studies about Newtonian and pseudo-plastic fluids. It seems that this mixing-length distribution is suitable for estimating and calculating both the velocity profile and the pressure loss for Newtonian and pseudo-plastic fluids flow in circular smooth pipes through the analyzed results as compared with experimental results. A set of design curves of friction factor versus Reynolds number is presented.

On the Flow Characteristics of the High Pressure Water Jet

For the purpose of considering the performance of nozzle of the hydraulic mining device and the nechanism of the hydraulic fracturing, the-authors defined experimentally the flow characteristics of high pressure water jet which were different from that of low pressure water jet. Under changing the discharge pressure between 4kg/cm2 and 60kg/cm2 at nozzle mouth with diameter 6mm, the results were summerized as follows; a) Divergence coefficient of iet;

On the Determination of the Performance of Nozzle of the Hydraulic Mining Device

Yukio YOSHIZAWA, Toshio KAWASHIMA, and Katuya YANAIDA For the purpose of determining the performance of nozzle of the hydraulic mining device, the authors investigated the flow characteristics of water jet which had ever studied theoretically and r ,experimentally under changing the discharge pressure between 3kg/cm2 and 10kg/cm2 at nozzle mouth with diameter 6 mm. The flow characteristics of water jet were given as follows; a) Divergence coefficient of jet;