Impinging jets are widely used for heat and mass transfer because they applicable to any type of body can be easily implemented. They also in various industrial fields design techniques. Previous research investigated e.g. a jet impinging onto flat surface. However, since most the mechanical parts have curvature on their surface, it is necessary study more detailed properties curved surface usi...

Advanced ventilation methods are responsible for creating an appropriate temperature environment with satisfactory inhaled air quality. The ductless personalized system integrated impinging jet shows the good performance. In order to investigate effect of using such on thermal comfort and quality improvement. Twenty subjects participated in a chamber test at 25 °C, 27 29 respectively, operating...

Cooktop burners are widely used nowadays. In cooktop burner design, nozzle efficiency and greenhouse gas(GHG) emissions mainly depend on heat transfer from the premixed flame to the impinging surface. This is a complicated issue depending on the individual and combined effects of various input combustion variables. Optimal operating conditions for sustainable burner design were rarely addressed...

In the laboratory we used an idealized rotorwash flow—an axisymmetric jet impinges normally on a packed bed of cohesionless particles—and measured the spatially varying flow field and entrainment flux under an axisymmetric jet over a range of jet exit velocities and bed materials. We found that the erosion of the bed is driven by turbulent surface shear stress, quantified by the turbulent kinet...

Fluid-jet-based indentation is used as a noncontact excitation technique by systems measuring the mechanical properties of soft tissues. However, the application of these devices has been hindered by the lack of theoretical solutions. This study developed a mathematical model for testing the indentation induced by a fluid jet and determined a semianalytical solution. The soft tissue was modeled...

In heating model, impinging jet ventilation (IJV) supplies warm air with high momentum which impinges and spread over floor. Thermal stratification in opposite direction (temperature of foot area is higher than head area.) found the near supply opening, because residual after can resist thermal buoyancy a considerable distance on floor surface. Negative vertical temperature gradient was seldom ...

Flip buckets are terminal spillway elements, generating free jets for energy dissipation. Deflectors are an alternative to flip buckets with constructional ease yet of similar hydraulic features. A first experimental study published at the 33 IAHR Congress, Vancouver, investigated deflectorgenerated jets in terms of their air concentration characteristics. For jet impact onto a movable bed, the...

We consider the steady laminar annular spread of a thin liquid film generated by a circular jet impinging perpendicularly in direction of gravity on the centre of a horizontally rotating disc (figure 1). The individual flow regimes arising due to the largeness of the Reynolds number formed with the radius of the jet, its slenderness, and the relative magnitude of the centrifugal force measured ...