Interfacial physico chemical study on engulfment and pushing of fine partcle in liquid solution by solidifying interface

凝固界面吞噬和推动溶液中细小颗粒的界面物理化学研究

• 批准号: 13450311
• 负责人: MUKAI Kusuhiro
• 金额: $ 9.02万
• 依托单位: Kyushu Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13450311/
• 关键词: Fine particle; Water solution; Solidifying interface; Surface tension gradient; Interfacial tension gradient; Motion of particle; Micro gravity; Normal gravity; 微細炭素粒子; 純水中; 温度勾配; 移動速度; 微細気泡の挙動; 濃度境界層; 微小重力環境; 航空機実験; マッハツェンダー干渉計

Behavior of fine bubbles in front of solidifying interface of C_8H_<17>SO_3Na water solution was directory observed under the gravity condition of μG and 1G by combining Mach-Zehnder interfernometer. Fine bubbles inside the concentration boundary layer of C_8H_<17>SO_3Na formed in front of the interface move quickly toward the interface and are engulfed by the interface. On the other hand, the bubbles outside the boundary layer, just float up under 1G or don't move under μG in the solution. The above motion of fine bubbles toward the interface can be explained reasonably based on the driving force, acting on the bubble, caused by the surface tension gradient along the bubble surface due to the concentration gradient of C_8H_<17>SO_3Na in front of the interface.Behavior of fine graphite particle in distilled water was directly observed under the gravity condition of μG and 1G. Sedimentation velocity of the particle in the water with temperature gradient was smaller than that in the water with uniform temperature under 1G gravity condition. We also observed a few graphite particles floated up in the water with temperature gradient under μG gravity condition. The temperature gradient, dT/dZ>0, where T is temperature, Z is the vertical height in the water. The above results indicates that the interfacial tension gradient along the interface between the particle and the liquid causes the motion of fine solid particle as well as fine bubble.Therefore, the behaviors of fine particles such as bubbles, liquid droplets and solid particles in front of the solidifying interface are dominantly influenced by the interfacial tension gradients caused by the gradients of concentration of surface active component and also temperature, which closely relates to the materials processing by the aid of solidification process.

利用<17>马赫-曾德尔干涉仪直接观察了在μG和1G重力条件下，C_8H_3Na水溶液凝固界面前沿细小气泡的行为。C_8H_SO_3Na浓度边界层内的细小气泡<17>在界面前形成，并迅速向界面移动，被界面吞没。另一方面，边界层外的气泡，在1G以下仅浮起或在μG以下不移动。根据界面前C_8H_3Na浓度梯度引起的气泡表面沿着表面张力梯度对气泡的驱动力，可以合理地解释上述微细气泡向界面的<17>运动。1G重力条件下，颗粒在有温度梯度的水中的沉降速度小于在均匀温度的水中的沉降速度。在μG重力条件下，我们还观察到少量石墨颗粒在有温度梯度的水中上浮。温度梯度，dT/dZ&gt;0，其中T是温度，Z是水中的垂直高度。上述结果表明，颗粒与液体之间的界面张力梯度沿着分布，引起了细颗粒的运动，同时也引起了细气泡的运动，因此，凝固界面前的液滴和固体颗粒主要受表面活性组分浓度梯度引起的界面张力梯度的影响，温度与材料的凝固过程密切相关。

项目成果

K.Mukai, et al.: "Motion of Fine Particle under Interfacial Tension Gradient in Relation to Continuous Casting Process"steel research. 74. 131-138 (2003)

K.Mukai等人：“与连续铸造过程相关的界面张力梯度下细颗粒的运动”钢研究。

K.Mukai, et al.: "Motion of Fine Particle under interfacial Tension Grandient in relation to Continuous Casting Process"steel research. 74・NO.3. 131-138 (2003)

K.Mukai等人：“与连续铸造过程相关的界面张力Grandient下的细粒运动”钢研究74・NO.3（2003）。

K.Mukai., et al.: "Motion of Fine Particle under Interfacial Tensio Gradient in Relation to Continuous Casting Process"steel research. 74-No.3. 131-138 (2003)

K.Mukai.等人：“与连续铸造过程相关的界面张力梯度下细颗粒的运动”钢研究。

K.Mukai, et al.: "Behaviour of Bubbles in Liquid Caused by Marangoni Effect in Relation to Steelmaking Process"PROCEEDINGS of the MILLS SYMPOSIUM. 145-153 (2002)

K.Mukai 等人：“与炼钢过程相关的马兰戈尼效应引起的液体中气泡的行为”米尔斯研讨会论文集。

K.Mukai., et al.: "Behavior of Bubbles in Liquid Caused by Marangoni Effect in Relation to Steelmaking Process"Proceedings of the Mills Symposium. 145-153 (2002)

K.Mukai.等人：“与炼钢过程相关的马兰戈尼效应引起的液体中气泡的行为”工厂研讨会论文集。