Experiments in Fluids
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Characterizing developing adverse pressure gradient flows subject to surface roughness
Experiments in Fluids - Tập 48 - Trang 663-677 - 2009
An experimental study was conducted to examine the effects of surface roughness and adverse pressure gradient (APG) on the development of a turbulent boundary layer. Hot-wire anemometry measurements were carried out using single and X-wire probes in all regions of a developing APG flow in an open return wind tunnel test section. The same experimental conditions (i.e., T
∞, ......
Sizing of sand and ash particles using their speckle pattern: influence of particle opacity
Experiments in Fluids - Tập 58 - Trang 1-8 - 2017
A speckle pattern is an interference pattern produced by coherent light scattered from an irregular particle. This pattern is observed in the out-of-focus plane of the particle and it can be used to obtain information about the particle size. When the particle is observed in focus, several bright spots known as glare points are observed on its surface. They correspond to the points from which the ......
Optical spinning rheometry test on viscosity curves of less viscous fluids at low shear rate range
Experiments in Fluids - Tập 64 - Trang 1-13 - 2023
We propose a method, named optical spinning rheometry (OSR), to acquire kinematic viscosity curves of Newtonian and non-Newtonian fluids in the same framework. The OSR is independent of torque measurements and utilizes velocity information measured by particle tracking velocimetry. This optical approach enables flexibility in velocity resolution, and benefits exploring the low shear rate region. I......
Đo lường đồng thời kích thước và vận tốc của bọt khí trong quá trình đầu tiên của sự hình thành bọt khí bằng cách sử dụng hình ảnh laser giao thoa Dịch bởi AI
Experiments in Fluids - Tập 50 - Trang 1153-1167 - 2011
Trong nghiên cứu này, phương pháp đo kích thước giọt bằng hình ảnh laser giao thoa (ILIDS) được áp dụng để nghiên cứu sự hình thành bọt khí mới xuất hiện trong luồng nước phía sau mô hình chân vịt thủy. Mục đích của nghiên cứu là đánh giá đồng thời vận tốc và đường kính của các bọt khí. Đến thời điểm hiện tại, tính khả thi của kỹ thuật này đã được chứng minh, đặc biệt là trong các phun sương của g......
#hình ảnh laser giao thoa #đo kích thước giọt #bọt khí #chân vịt #luồng nước
A four-sensor hot-wire probe system for three-component velocity measurement
Experiments in Fluids - Tập 24 - Trang 416-423 - 1998
A velocity measurement system based on a miniature four-sensor hot-wire probe capable of simultaneous three-component measurements throughout a wide range of flow angles has been developed. The calibration technique allows measurements to be made throughout the acceptance cone of the probe without being restricted by the errors associated with analytic angle response equations. This technique is ......
The effect of a small isolated roughness element on the forces on a sphere in uniform flow
Experiments in Fluids - Tập 51 - Trang 1031-1045 - 2011
The effect of an isolated roughness element on the forces on a sphere was examined for a Reynolds number range of 5 × 104 < Re < 5 × 105 using a novel sting-mounted sphere apparatus. The roughness element was a circular cylinder, and its width and height was varied to be 1, 2, and 4% of the sphere diameter. At subcritical Re, a lateral force is produced in the direction of the roughness, while at ......
Decay of the drag wake of a sphere at Reynolds number $$10^5$$
Experiments in Fluids - Tập 63 Số 4 - Trang 1-13 - 2022
The drag wake of a dimpled sphere with $$Re = 10^5$$ is studied experimentally using Stereo Particle Image Velocimetry to a downstream distance of $$\sim 90$$ diameters. The wake growth and velocity decay are analyzed and compared with previous dimpled sphere data for $$Re = 5 \cdot 10^4$$ . Self-similar decay was observed with the ensemble mean axial velocity defect decaying as $$x^{-1}$$ and the......
Dynamics of particles floating on liquid flowing in a semicircular open channel
Experiments in Fluids - Tập 12 - Trang 106-112 - 1991
The dynamic characteristics of surface-floating particles in liquids flowing in a two-dimensional, semicircular open channel is studied experimentally. For high visibility in the experiments, relatively large particles are employed whose particle-liquid density ratio is either equal to or less than unity. Particles of different size and geometry are tested in a water-glycerin mixture. A video came......
Measurement of mass transfer across a moving mercury-electrolyte interface by an electrochemical method
Experiments in Fluids - Tập 19 - Trang 353-358 - 1995
We develop an electrochemical technique in order to measure the mass transfer across a moving mercuryelectrolyte interface. The method is tested on an electromagnetically excited interface. It allows a continuous time measurement of the mass transfer across an agitated interface between two liquids.
Curved laser-sheet for conformal surface flow diagnostics
Experiments in Fluids - Tập 50 - Trang 761-768 - 2010
Three-dimensional surface illumination using curved laser-sheet techniques is introduced for optical flow measurements in conformal curved surfaces. The illumination method is applicable to many different optical-based flow measurement techniques, with this paper focusing on application to flow visualization and particle image velocimetry. A brief discussion and example of curved laser-sheet gener......
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