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Significance of including lid thickness and particle shape factor in numerical modeling for prediction of particle trap efficiency of invert trap

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Water Science and Engineering 2024年第2期17卷 166-176页

作者： salman beg Deo Raj Kaushal Department of Civil Engineering Indian Institute of Technology DelhiNew Delhi 110016India

Sediment accumulation on the bed of open sewers and drains reduces hydraulic efficiency and can cause localized *** invert traps installed underneath the bed of open sewers and drains can eliminate sediment build-up by catching sediment *** three-dimensional(3D)computational studies have examined the particle trapping performance of invert traps of different shapes and depths under varied sediment and flow conditions,considering particles as *** two-dimensional and 3D numerical modeling,researchers assumed the lid geometry to be a thin line and a plane,*** this 3D numerical study,the particle trapping efficiency of a slotted irregular hexagonal invert trap fitted at the flume bottom was examined by incorporating the particle shape factor of non-spherical sewage solid particles and the thicknesses of upstream and downstream lids over the trap in the discrete phase model of the ANSYS Fluent 2020 R1 *** volume of fluid(VOF)and the realizable k-turbulence models were used to predict the velocity *** two-dimensional particle image velocimetry(PIV)was used to measure the velocity field inside the invert *** results showed that the thicknesses of upstream and downstream lids affected the velocity field and turbulent kinetic energy at all flow *** joint impact of the particle shape factor and lid thickness on the trap efficiency was *** both the lid thickness and particle shape factor were considered in the numerical modeling,trap efficiencies were underestimated,with relative errors of-8.66%to-0.65%in comparison to the experimental values of Mohsin and Kaushal(2017).They were also lower than the values predicted by Mohsin and Kaushal(2017),which showed an overall overestimation with errors of-2.3%to 17.4%.

关键词： Invert trap Lid thickness Particle image velocimetry Particle shape factor Turbulent kinetic energy Scanning electron microscope

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Comparison of Shisha Smoking Behavior among Medical and Pharmacy Students

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Journal of Behavioral and Brain Science 2016年第7期6卷 269-279页

作者： Ashok Kumar salman Baig Sana Ansari Nadeem Rizvi Huma Sharif Anwar Ejaz beg Ammara Rauf Faraz Ahmed Baig Ammara Abdul Majeed Ziauddin Hospital Karachi Pakistan Sindh Medical College Karachi Pakistan

Background: Health care workers are respected in every society and have a strong influence on the behaviour of the community. In order to reduce the shisha dependence in the Pakistani population, it is necessary to evaluate the perspective of future doctors and pharmacists regarding this addiction as they become role models for the future generations. Objective: The aim is to compare the knowledge, attitudes, and practices of shisha use among medical students and pharmacy students in order to assess their support in the anti-shisha campaigns of Pakistan. Methodology: Cross sectional study was performed in four major medical universities of Karachi, Pakistan through a modification of the WHO global health survey questionnaire. Result: 398 medical students and 470 pharmacy students were included in the study which showed that currently 9.6% pharmacy students and 4.8% medical students used shisha daily (p = 0.000). Pharmacy students started shisha use in less than 15 years of age while this number was 29.5% among medical students (P = 0.000). Moreover, 44.6% pharmacy students and 50% medical students were not planning to quit this addiction within the next six months. 14% of pharmacy students and 20.4% in medical students (P = 0.002) were unaware that passive smoking caused lung cancer, while 23.4% pharmacy students and 33.5% medical students rejected it as cause of heart diseases (p = 0.006). Conclusion: A significant number of medical and pharmacy students were unaware about some of the serious consequences of shisha smoking. Therefore, both groups of students need to be educated about the health hazards of shisha use, in order to control this growing menace.

关键词： Shisha Smoking Tobacco Students

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