NUST Institutions Library Catalogue Search for 'an:"122293"'

Impact of mass ratio and surface roughness on vortex induced vibrations /

By Usman Anwar ,Muhammad. . 63p. ; 30cm..

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Mixing enhancement in microchannel by changing parameters of thermal waves using TVEC effect /

By Asif , Muhammad. . 90p. ; 30cm..

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Numerical investigation of flow around fixed cylinder at Re=3900: Study of spanwise length optimization /

By Ali ,Haider . . 46p. ; 30cm..

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Impact of surface roughness on energy harvesting: Comparative study of smooth and rough cylinder /

By Bucha ,Muhammad Hammad. . 47p. ; 30cm..

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CFD in Drinking Water Treatment

By Hassan, Ali . . 57p. , An upgraded model was developed by employing a combination of Eulerian-Eulerian two-phase approach and user defined function (UDF) to solve the water-ozone flow and interaction in an ozone contactor using computational fluid dynamics (CFD). Moreover, geometric configuration of the contactor was optimized to improve the performance of the contactor. As indicators Residence Time Distribution (RTD) and Dissolved Ozone Concentration (C) were used for single phase and two-phase CFD models. Validation of experimental data already available in the literature was done for RTD and then its impact on C was studied using different contactor configurations. From simulations it was evident that optimizing structural configurations can greatly reduce the size of recirculation zones, dead zones and short-circuiting. As a result, an increase of 71.6% was observed in dissolved ozone concentration in the geometry containing double-sided horizontal baffles. 30cm.

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CFD in Drinking Water Treatment

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CFD in Drinking Water Treatment

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Hydrodynamic and Hydro acoustic analysis of marine Propeller /

By Nazeer, Ammar . . 59p. , A detailed hydrodynamic and hydro acoustic analyses of a four bladed marine propeller INSEAN E-779A was carried out in this study. Unsteady RANS model k-ω SST was used to assess the hydrodynamics of propeller, while acoustic of propeller were studied by deploying Ffowcs William hawking acoustic analogy. Hydrodynamic and hydro acoustic characteristics were studied by changing advance ratio (J) from 0.6 to 0.9 along with change in flow incidence angle to the propeller (θ) from 0 – 40 degrees. Hydrodynamic Coefficients like thrust coefficient KT and torque coefficient KQ were determined along all directions for different values of J and θ. These coefficients were plotted to study their trends and how they effected the overall operational efficiency of the propeller. Efficiency decreased from 64% at 0 degrees to 28 % at 40 degrees for J=0.88 and from 51 % to 40% for J=0.6. Detailed directivity analysis was carried out for different sets of flow conditions to see how acoustic distribution around propeller changed. Acoustic pressure changed by 19%, 16.5% and 31% in XY, XZ and YZ planes respectively with change in advance ratio from 0.88 to 0.6 at 40 degrees. Moreover, FFT analysis of the acoustic signal was carried out to see which frequencies become dominant at different flow conditions and how acoustic signature changes at various distances in the wake of propeller. Peak SPL values were observed at 1xBPF and 2xBPF at various distances in the wake of the propeller to see how they are affected by the change in flow conditions. Near field and far field acoustic signature was also studied to see how the acoustic behavior changed with distance. 30cm.

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