Abhishek Mishra

University of Surrey · Department of Mechanical Engineering Sciences

Wind tunnel experiments were conducted to understand the effect of building array size (N), aspect ratio (AR), and the spacing between buildings (\(W_S\)) on the mean structure and decay of their wakes. Arrays of size 3\(\times \)3, 4\(\times \)4,and 5\(\times \)5, AR = 4, 6, and 8, and \(W_S\) = 0.5\(W_B\), 1\(W_B\), 2\(W_B\) and 4\(W_B\) (where \...

The present study aims at understanding the effect of external pulsations on the flow characteristics in the downhill region of an oblique jet impingement with the help of particle image velocimetry. The distance between nozzle exit and the wall is kept constant at L=4D (D is the diameter of the nozzle) and Re=1900 (based on nozzle diameter and the...

Wind tunnel experiments were conducted to understand the effect of building array size ( N ), aspect ratio ( AR ), and the spacing between building ( W S ) on the mean structure and decay of their wakes. Arrays of size 3×3, 4×4,and 5×5, AR = 4, 6, and 8, and W S = 0.5 W B , 1 W B , 2 W B and 4 W B (where W B is the building width) were considered....

The present experimental study investigated the synthetic jet flow characteristics issued from four different orifice shapes (Re = 4739-5588). The flow dynamics of the jet is examined using the particle image velocimetry technique for circular, rectangular, square, and elliptical orifice shapes and two different surface spacings (z/d =3 and 8). The...

The effect of free stream turbulence on flow around a corrugated airfoil at ultra low Reynolds numbers have been investigated using particle image velocimetry. The experiments are undertaken at Re = 960-11700, Angle of Attack (AoA) = +5°, −5° and Turbulence Intensity (TI) = 6%. The present study is perhaps the first study to explore the effect of f...

An experimental study to investigate the effect of jet pulsations on the wall jet development in the uphill region of an obliquely inclined round water jet has been performed using particle image velocimetry technique. The study has been performed at a constant nozzle to target wall distance, L/D = 4 (D is the diameter of the nozzle) by varying the...

The present study aims to identify the dominant coherent structures in the wall jet flow subjected to external pulsation at Reynolds number 2600 (based on average jet exit velocity and nozzle diameter). The forcing frequency is varied between St¼0 and 0.99 (St is the Strouhal number). Quadrant analysis is employed to identify the relative contribut...

The present study aims to identify the dominant coherent structures in the wall jet flow subjected to external pulsation at Reynolds number 2600 (based on average jet exit velocity and nozzle diameter). The forcing frequency is varied between St ¼ 0 and 0.99 (St is the Strouhal number). Quadrant analysis is employed to identify the relative contrib...

In the present work, Particle Image Velocimetry technique is used to investigate the effect of jet pulsation in the wall jet region of a turbulent impinging jet. A water jet exits a 15.6-mm diameter (D) nozzle into quiescent water and impinges on a target plate kept at a distance of 4D from the nozzle exit. The PIV measurements are taken at a const...

An experimental study has been performed by using particle image velocimetry to investigate the effect of nozzle-to-plate separation distance (L) and jet impingement angle on the flow characteristics of an obliquely inclined submerged water jet. Measurements were taken for L = 1D, 2D, 4D and 6D (where D is the diameter of the nozzle) for the jet im...

Particle image velocimetry-based measurements for an axisymmetric turbulent jet impinging on a semi-circular concave surface have been undertaken as part of this work. The focus is on studying the ensuing boundary layer formed on the curved surface. The measurements were performed for three different surface curvatures and different distances betwe...

Spacings between nozzle and plate tend to affect the flow behaviour in wall jet region. PIV experiments have been conducted at various nozzle to plate spacing, the surface spacing being varied from 1 to 6 nozzle diameter for an angle of impingement of the jet to be 45o and at Reynolds number of 2600. Different flow behaviour is observed on either s...

Spacings between nozzle and plate tend to affect the flow behaviour in wall jet region. PIV experiments have been conducted at various nozzle to plate spacing, the surface spacing being varied from 1 to 6 nozzle diameter for an angle of impingement of the jet to be 45 o and at Reynolds number of 2600. Different flow behaviour is observed on either...