Experimental Study on Pressure Loss of CTAB/NaSal Aqueous Solution through Slots and a Capillary
スポンサーリンク
概要
- 論文の詳細を見る
Aqueous solutions of cetyltrimethylammonium bromide (CTAB) and sodium salicylate (NaSal) were made to flow through two-dimensional slots and a capillary, and pressure losses ΔP were measured under various conditions to investigate its flow properties. In the results with slot flow, the flow curves relating ΔP to the apparent elongational rate consisted of three characteristic regions. In the first region of low flow rate, the flow curve showed a gentle slope with the pressure loss increasing with elongational rate. In the second region of intermediate flow rate, ΔP increased sharply, which was thought to be caused by flow induced structure (FIS). In the third region of relatively high flow rate, the slope of the flow curve became gentle again. Here, it should be noted that ΔP in the third region was much higher than that in the first region; for example, the third region provides one order of magnitude larger ΔP than the first region for the concentration of CTAB (Cd) = 3×10-2 mol/L solutions, and it gives two or three orders of magnitude larger ΔP than the first region for Cd = 5×10-4 mol/L solutions. Furthermore, the flow field was visualized using reflex powders and a laser light sheet in slot flows. Observations of the flow field indicated that there are three types of flow field corresponding to the three regions of the flow curve. The first region showed a Newtonian-like flow field. The second region exhibited vortices and a contraction flow upstream of the entrance. In the third region, the vortices and the contraction flow fluctuated with increase in elongational rate. On the other hand, experiments regarding the pressure loss in capillary flow for Cd = 3×10-2 mol/L solutions showed the same character as slot flow. For Cd = 5×10-4 mol/L solutions, however, the character of the capillary flow curve was completely different from that of slot flow, and the flow curve of capillary flow was almost a normal type of Newtonian viscous flow. Consequently, we postulated that a considerable FIS is generated in the flow around the inlet of the capillary, but it collapsed in the downstream capillary flow for such dilute solutions as Cd = 5×10-4 mol/L.
- 2008-06-15
著者
-
Okawara Makoto
Graduate School Of Science And Technology Niigata University
-
Narumi Takatsune
Faculty of Engineering, Niigata University
-
HASEGAWA Tomiichi
Faculty of Engineering, Niigata University
-
IINO Yoshihiko
Graduate School of Science and Technology, Niigata University
-
Iino Yoshihiko
Graduate School Of Science And Technology Niigata University
-
Narumi Takatsune
Faculty Of Engineering Niigata University
-
Hasegawa Tomiichi
Faculty Of Engineering Niigata University
関連論文
- Experimental Study of Pressure Loss and Rheo-Optical Behavior of CTAB/NaSal Aqueous Solution under Elongational Flow
- Experimental Study on Pressure Loss of CTAB/NaSal Aqueous Solution through Slots and a Capillary
- Measurement of Dynamic Surface Tension of Surfactant Solutions
- A Simple Model for the Dynamic Surface Tension of Polymer Solutions
- Flow Properties of Several Types of Liquid Flows through Micro-Orifices
- Flow Behavior of Herschel-Bulkley Fluid in a Slot Die
- Experimental Study on the Squeezing Flow of Viscoelastic Fluids : 1st Report, The Effect of Liquid Properties on the Flow between a Spherical Surface and a Flat Plate
- Experiments on the Reverse Squeezing Flow of Dilute Polymer Solutions : Fluids with Newtonian Viscosity
- A Study on Anomalous Turbulent Flows of Non-Newtonian Fluids : 3rd Report, Experiment and Analysis in Transitional Region
- Measurement of the First Normal Stress Differences of Water and Dilute Polymer Solutions
- Flow Behavior of Herschel-Bulkley Fluid in a Slot Die
- Measurement of Dynamic Surface Tension of Surfactant Solutions