Masaaki Tamagawa

Observation of Thrombus Formation Process by High Shear Rate on Various Flows and CFD Based Prediction Method for Thrombus Formation Rate

This paper describes visualization of thrombus formation process on orifice flows and Couette flows by normal illumination. The aim is to investigate the effects of shear stress or shear rate on the thrombus formation or thrombus formation rate. It was found that (1) effect of flow types on the thrombus ratio was obtained and (2) quantitative evaluation of thrombus formation rate by our proposed CFD based prediction method was established for various flows.Copyright

Development of Water Treatment Systems Using Interaction of Pressure Waves, Cavitation Bubbles and Micro Bubbles

This paper describes the fundamental investigations for developing new water treatment system using cavitation bubbles, micro bubbles and pressure waves (shock waves). To understand the fundamental phenomena of interaction of these factors, the pressure using cavitation bubbles and micro bubbles was measured, and the influence of micro bubble on the cavitation water treatment system was investigated. From these results, it was concluded that (1) there are two types of bursting pressure histories when pressure waves and cavitation bubble are working on micro-bubble, (2) frequency of bursting pressure from micro bubble and cavitation bubbles was increased by increasing working pressure, (3) the efficiency of water treatment was increased by increasing cavitation bubbles, (4) the improved water treatment system was proposed by changing the seeding position of the micro bubbles.Copyright

Development of DDS Capsules Including Gas Bubbles by Shock Waves and Their Applications

This paper describes development of shock wave drug delivery systems, especially deformation process of a bubble in a microcapsule composed of membrane, liquid and gas bubble.

Analysis of Thrombus Formation Process by Flow Induced High Shear Rate Using Optical Observation Method

This paper describes visualization of thrombus formation process on orifice flows by laser sheet beam and normal illumination. The aim is to investigate the effects of shear stress or shear rate on the thrombus formation or thrombus formation rate. It was found that the white thrombus formation rate is proportional to square root of shear rate, and the white thrombus is dominant when the shear rate is more than 450 (1/s).Copyright

Analysis of a bubble deformation process in a microcapsule by shock waves for developing DDS

This paper describes development of DDS (drug delivery systems) microcapsule using underwater shock waves, especially (1) making polymer microcapsules including a bubble and analysis of a bubble deformation process in a polymer capsule by pressure wave, (2) making liposome microcapsules with different elastic membrane and disintegration tests by ultrasonic waves.