نتایج جستجو برای: flat tubes
تعداد نتایج: 85384 فیلتر نتایج به سال:
We call a ring $R$ right generalized semiperfect if every simple right $R$-module is an epimorphic image of a flat right $R$-module with small kernel, that is, every simple right $R$-module has a flat $B$-cover. We give some properties of such rings along with examples. We introduce flat strong covers as flat covers which are also flat $B$-covers and give characterizations of $A$-perfe...
This paper investigates axial compression process of multi-layered tubes with circular cross-section under the axial loading in the quasi-static condition using experimental method. Some specimens are prepared in seven different groups, namely; empty carbon/epoxy composite tubes, solid carbon/epoxy composite rods, empty copper tubes, composite tubes with silicon sealant filler, concentrically s...
OBJECTIVE Insertion of tympanostomy tubes is the most common ambulatory surgery performed on children in the United States. Tympanostomy tubes are most often inserted because of persistent middle ear fluid, frequent ear infections, or ear infections that persist after antibiotic therapy. Despite the frequency of tympanostomy tube insertion, there are currently no clinical practice guidelines in...
The evacuated tube solar collector ETC is studied intensively and extensively by experimental andtheoretical works, in order to investigate its performance enhancement of heat transfer, for Baghdad climatefrom April 2011 till the end March 2012. Experimental work carried out on a well instrumented collectorconsists 16 tubes aspect ratio 38.6 thermally insulated tank volume 112L. relationbetween...
This paper presents results of an experimental investigation on pressure drop and heat transfer for a wide range Reynolds Prandtl numbers ranging from 8 < Pr 60 40 Re 3500, flat tubes without with passive inserts. For three different kinds insert designs, the impact momentum due to coaction total set inserts shape amount was investigated. Experimental were analyzed regarding two main aspects...
in this paper, analysis of fluid flow and heat transfer over the bank of tubes is considered. k-ω sst model is applied for simulation of turbulent flow. in this paper, the improvement of efficiency of a bundle of circular tubes by changing the shape of the cross section of one row of the pipes to the elliptical cross section as an innovative plan is considered. as know, friction factor in turbu...
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