An experimental and numerical study of impinging, incompressible, axisymmetric, laminar jets is described, where the jet axis of symmetry is aligned normal to the wall. Particle streak velocimetry (PSV) is used to measure axial velocities along the centerline of the flow field. The jet-nozzle pressure drop is measured simultaneously and determines the Bernoulli velocity. The flow field is simul...

Studies of the dynamical response of thin atmospheric layers overlying thick envelopes are extended to examine how multiple jets, such as those seen on Jupiter and Saturn, can be generated and maintained. The jets are produced by baroclinic instabilities and are examined numerically using a primitive equation model subject to simple heating functions. The motions are confined to a thin upper la...

A simple model shows that acceleration of Jupiter and Saturn’s multiple jets at altitudes confined near the top of the adiabatic region (e.g., at a few bars pressure) can produce jets that penetrate deeply into the molecular envelope. This result disproves the common assertion that jet acceleration near the outer margin can only produce zonal winds that are confined to these outer layers. © 200...

When a jet of gas impinges vertically on a granular bed and forms a crater, the grains may be moved by several different mechanisms: viscous erosion, diffused gas eruption, bearing capacity failure, and/or diffusion-driven shearing. The relative importance of these mechanisms depends upon the flow regime of the gas, the mechanical state of the granular material, and other physical parameters. H...

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...

The characteristics of effectiveness and heat transfer for a row jets impinging on corrugated surface were experimentally investigated. Reynolds number, Re which was calculated based the exit velocity hydraulic diameter nozzle, 20000 jet-to-target spacing, L, varied from 2 to 10 times jet diameter, d. spacing between adjacent jets, Sx, kept constant at 4d. actual angle impingement distance diff...

During its near-ground hovering phase a Short Take-Off and Vertical Landing (STOVL) aircraft creates a complex three-dimensional flow field between jet streams, the airframe surface and the ground. A proper understanding and numerical prediction of this flow is important in the design of such aircraft. In this paper an experimental facility, used to gather validation data suitable for testing C...