急縮小流路における粘弾性流体の旋回流れの速度場の測定

概要

論文の詳細を見る
The entry pressure loss of viscoelastic fluids is known to be reduced by the effect of the upper wall when the flow pattern is a spiralling flow. To investigate the mechanism of this effect, the velocity distribution in the region of entry into a capillary from a large reservoir was measured by a two-color three-beam laser Doppler velocimeter. The instantaneous velocity field was determined for the spiralling flow, as well as for the steady radial flow with vortex at a lower flow rate. It was confirmed that a frozen pattern of velocity profile similar to that of the steady flow rotates around the channel axis with a fixed period. However, no significant difference was discerned between velocity profiles with and without entry pressure loss reduction.
一般社団法人日本機械学会の論文
1989-12-25