نتایج جستجو برای: flow structure
تعداد نتایج: 1975571 فیلتر نتایج به سال:
In this study, the effects of the volute tongue geometry variation on the head, efficiency, velocity distribution and cavitation structure of a centrifugal pump in the steady flow behavior under off-design conditions have been investigated. Numerical simulation modeling based on the turbulence model with a hybrid grid is used to simulate the flow within the modeled pump. The flow is simulated ...
In regard to wide piers, the pile group rather than single pile is used frequently to bear the loading of the structure in a particular arrangement; piles group composed of only one column of piles in the flow direction has a great effect on supporting the bridge deck. In this study, local scour at a single column arrangement of the piles group made up of four rows of piles characterized by dif...
چکیده ندارد.
Nanostructured TiO2-SnO2 thin-film ethanol sensors have been fabricated on glass substrates using electron beam and sol-gel methods. The surface structure, morphology and optical transmission characteristics of the films were analyzed by X ray diffraction, scanning electron microscopy and UV/VIS/NIR spectrometry. The TiO2-SnO2 films were less than 300 nm thick and consisted of nanocrystallines ...
دریچه های هیدرولیکی سازه های متحرکی هستند که به منظور قطع و وصل جریان، تنظیم دبی و تنظیم سطح آب مورد استفاده قرار می گیرند. از بین انواع دریچه ها، دریچه های کشویی به دلیل سهولت در ساخت و بهره برداری، دارای کاربرد وسیعی در کارهای آبی هستند. تاکنون تحقیقات زیادی بر روی دریچه ها ی کشویی با عرض کانال یکسان در بالادست و پایین دست دریچه انجام شده است.در تحقیق حاضر خصوصیات جریان از زیر دریچه ی کشویی د...
In this study, the transport of nalidixic acid-resistant Escherichia coli (E. coli NAR) through two soils of sandy loam and clay loam was investigated. Saturated and unsaturated flow conditions were applied at two temperatures of 5 and 20ºC. Leaching was done using large repaired soil columns which had been subjected to physical weathering. A 20-cm diameter disk infiltrometer was set up to esta...
The study on the flow behave inside of a ball valve is important for heavy crude oil transportation. Owe to the fast progress of the numerical technique, it becomes an effective way to observe the flows inside a valve and to analyze the flow structure of the oil-water core annular flow. In the present study, the simulation of the oil-water core annular flowing through the valve is conducted...
Background: Numerical study of angulation effects of renal arteries on blood flow has been of great interest for many researchers.Objective: This paper aims at numerically determining the angulation effects of stenosed renal arteries on blood flow velocity and renal mass flow.Method: An anatomically realistic model of abdominal aorta and renal arteries is reconstructed from CT-scan images and u...
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