69 citations · 129 across the 11 of their papers we have counts for
11 papers
Static and Dynamic Estimation of Flexural Rigidity of Soybean
Akihito Kiyama, Haruka Tomobe, Jisoo Yuk +2
This paper evaluates a cantilever system as a simple method for measuring the mechanical rigidity (bending rigidity EI or Young's modulus E) of plants. Using soybeans as a test sam…
Pressure fluctuations of liquids under short-time acceleration
Chihiro Kurihara, Akihito Kiyama, Yoshiyuki Tagawa
This study experimentally investigates the pressure fluctuations of liquids in a column under short-time acceleration and demonstrates that the Strouhal number [, wh…
On the Jets Induced by a Cavitation Bubble Near a Cylinder
Yuxin Gou, Junrong Zhang, Akihito Kiyama +1
The dynamics of cavitation bubbles in the vicinity of a solid cylinder or fibre are seen in water treatment, demolition and/or cleaning of composite materials, as well as bio-medic…
Toroidal cavitation by a snapping popper
Akihito Kiyama, Sharon Wang, Sunghwan Jung
Cavitation is a phenomenon in which bubbles form and collapse in liquids due to pressure or temperature changes. Even common tools like a rubber popper can be used to create cavita…
The water entry surface seal behavior of spheres at intermediate speed regimes
Akihito Kiyama, Rafsan Rabbi, Nathan Speirs +3
This research focuses on the water entry of spheres in the surface seal regime. Herein, surface seal occurs in the wake of a sphere impact with the water surface and is characteriz…
Size Effect on Reaction Rate of Surface Nanodroplets
Zhengxin Li, Akihito Kiyama, Xuehua Zhang +1
Compartmentalizing reagents within small droplets is promising for highly efficient conversion and simplified procedures in many biphasic chemical reactions. In this work, surface…
The direction of the microjet produced by the collapse of a cavitation bubble locatedin between a wall and a free surface
Akihito Kiyama, Takaaki Shimazaki, José Manuel Gordillo +1
In this paper, we present a simplified theoretical model based on the method of images that predicts the direction of the microjet produced after the implosion of the cavitation bu…
Speeding up biphasic reactions with surface nanodroplets
Zhengxin Li, Akihito Kiyama, Hongbo Zeng +2
Biphasic chemical reactions compartmentalized in small droplets offer advantages, such as streamlined procedures for chemical analysis, enhanced chemical reaction efficiency and hi…
Impact force reduction by consecutive water entry of spheres
Rafsan Rabbi, Nathan Speirs, Akihito Kiyama +2
Free-falling objects impacting onto water pools experience a very high initial impact force, greatest at the moment when breaking through the free surface. Many have intuitively wo…
Effects of pressure impulse and peak pressure of a shock wave on microjet velocity and the onset of cavitation in a microchannel
Keisuke Hayasaka, Akihito Kiyama, Yoshiyuki Tagawa
The development of needle-free injection systems utilizing high-speed microjets is of great importance to world healthcare. It is thus crucial to control the microjets, which are o…
A focused liquid jet formed by a water hammer in a test tube
Akihito Kiyama, Yoshiyuki Tagawa, Keita Ando +1
We investigate motion of a gas-liquid interface in a test tube induced by a large acceleration via impulsive force. We conduct simple experiments in which the tube partially filled…