Abstract In this work, the experimental data are compared with version of “strong” jet (Re ≫ 1) exact Landau-Squire solution. The experiments were performed for a submerged air flowing out tube diameter D = 3.2 mm and length more than 100 at Reynolds number equal to Re 436. initial conditions in Poiseuille velocity profile, level pulsations is less 1%. Measurements carried using hot-wire anemom...

The paper describes a study that forms part of a measurement assurance program (MAP) in place at Ford Motor Company. The purpose of a MAP is to assure on an ongoing basis that the total uncertainty associated with a measurement process meets the requirements of the customer. The gage repeatability and reproducibility study and statistical control chart are two traditional parts of the Ford MAP....

in this study, changes in speed and turbulence intensity in the wake of a peugeot model and the drag coefficient changes with increases vehicle speed in unsteady flow measured and evaluated. the blow open circuit wind tunnel to simulate fluid flow is used. disturbances and nominal maximum speed of the device, respectively is, 30 m / s and 0.01%. has been continuously increasing speed by an inve...

A compact and low-power consuming fiber-optic anemometer based on single-walled carbon nanotubes (SWCNTs) coated tilted fiber Bragg grating (TFBG) is presented. TFBG as a near infrared in-fiber sensing element is able to excite a number of cladding modes and radiation modes in the fiber and effectively couple light in the core to interact with the fiber surrounding mediums. It is an ideal in-fi...

The use of a chevron nozzle/orifice is one the methods heat transfer enhancement and noise reduction. In case synthetic jets, number papers on this topic small. Therefore, jet actuator with three different orifices circular orifice investigated. aim study to find impact shape centerline velocity (measured hot-wire anemometer) determine if reduces generated noise. sound pressure level was strong...

Abstract We present the new (for Mach numbers М = 3 and 3.5) generalizing from 2 to 4) results of experimental investigations on effect small angles attack laminar-turbulent transition in supersonic boundary layer a swept wing with leading-edge slip angle 72°. The angle-of-attack variation has strong Reynolds number. number decreases increase measurements were carried out by means constant-temp...

– The two-point correlation function of the energy dissipation, obtained from a one-point time record of an atmospheric boundary layer, reveals a rigorous power law scaling with intermittency exponent μ ≈ 0.20 over almost the entire inertial range of scales. However, for the related integral moment, the power law scaling is restricted to the upper part of the inertial range only. This observati...

In this paper we present the impact of hot wire geometry and fluid characteristics on the efficiency of a hot wire to be used as a wall shear stress sensor. Finite differences and finite elements modelling based simulators were used in order to evaluate the thermal performances of hot wire wall shear stress sensor. Several structures were explored including simple conductor or suspended above a...