نتایج جستجو برای: pressure coefficient

تعداد نتایج: 566915  

Journal: :Geotechnique 2023

The Skempton pore pressure coefficient, B, is defined as the variation in with unit change confining under undrained conditions. B parameter an essential to consider coupled effects of solid–fluid compressibility and skeleton a porous system. It key factor exploring possible definition effective stress frozen soil. However, limited experimental theoretical research available literature give ins...

Journal: :journal of advanced materials and processing 0
mehdi manouchehrian south tehran branch, islamic azad university, tehran, iran

tan films with different n2 partial pressure were deposited on 304 stainless steel using the magnetron sputtering method. the effect of gas pressure on the mechanical property, morphology and phase structure of the films is investigated by x-ray diffraction (xrd), atomic force microscopy (afm), microhardness testing, friction coefficient measurements, and wear mechanism study. the xrd results c...

Journal: :journal of heat and mass transfer research(jhmtr) 2014
mohammad hadi hamedi estakhrsar mehdi jahromi

compressible gas flow inside a convergent-divergent nozzle and its exhaust plume atdifferent nozzle pressure ratios (npr) have been numerically studied with severalturbulence models. the numerical results reveal that, the sst k–ω model give the bestresults compared with other models in time and accuracy. the effect of changes in value ofdivergence half-angle (ε ) on the nozzle performance, thru...

2001
Heiko K. Cammenga Friedrich W. Schulze

Measurements of the vapor pressure in the range 291 to 341 K and of the evaporation coefficient of liquid glycerol are reported. In contrast to the results of other authors a unit evaporation coeff lcient is found. The higher vapor pressures given by several other authors are shown to be due to minute traces of water. Using our low temperature data and the data of reliable investigations at hig...

Journal: :مکانیک سیالات و آیرودینامیک 0
محمد حججی محمدرضا سلطانی محمد طیبی رهنی

an experimental study has been performed to investigate the flow physics of an under-expanded axisymmetric supersonic jet exhausting transversely from a flat plate into a subsonic compressible cross flow. the goal was to study the effects of boundary layer thickness ratio (δ/d) and the jet to free stream dynamic pressure ratio (j) on surface pressure. the resulting measurements distinctly show ...

Journal: :معماری و شهرسازی آرمان شهر 0
mohammadjavad mahdavinejad assistant professor, department of architecture, faculty of art and architecture, tarbiat modares university, tehran, iran. kavan javanroodi m. sc. in architecture, faculty of art and architecture, tarbiat modares university, tehran, iran.

characteristics of efficient roof shape is a part of configuration of efficient architecture which seems to be an ideal in contemporary architecture especially in contemporary architecture of developing countries such as iran. this study is to investigate two roof shapes in view of air flow and indoor-temperature to find efficient roofs shapes for residential buildings in tehran. computational ...

Journal: :American Journal of Science 1897

2014
Pascal Molton David Hue

Cf = skin friction coefficient CD = drag coefficient CDf = friction drag coefficient CDp = pressure drag coefficient h = step height M0 = freestream Mach number Patm = atmospheric pressure Pi = stagnation pressure Re = freestream Reynolds number Ti = stagnation temperature U = velocity U = normalized velocity Uτ = friction velocity X = longitudinal coordinate Z = vertical coordinate Z = normali...

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