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تعداد نتایج: 2879536 فیلتر نتایج به سال:
Due to its low global warming potential (GWP) and good environmental properties, CF3I can be a suitable component of refrigerant mixtures in the field refrigeration air conditioning. In this work, local condensation heat transfer characteristics were experimentally investigated plate exchanger (PHE). The experiments carried out under conditions vapor qualities from 1.0 0.0, at saturation temper...
CONTEXT Flow cytometric immunophenotyping is a useful ancillary tool in the diagnosis and subclassification of acute myeloid leukemias (AMLs). A recent study concluded that CD64 is sensitive and specific for distinguishing AMLs with a monocytic component (ie, AML M4 and AML M5) from other AML subtypes. However, in that study, the intensity of CD64 was not well defined and the number of non-M4/n...
In present study, the two phase flow boiling heat transfer coefficient and pressure drop of R410A, R32 and R290 in microchannels are demonstrated. The experimental data were conducted in horizontal stainless steel tubes with the inner diameter of 0.3 mm and 1.5 mm. The testing conditions were performed with the mass fluxes range from 200 to 500 kg/m2s, the heat fluxes from 10 to 20 kW/m2, the s...
This study investigates flow boiling of n-Perfluorohexane with saturated two-phase mixture inlet in a rectangular channel dimensions 114.6 mm heated length, 2.5 width, and 5 mm-height. The experiments were performed as part the Mission Sequence Testing Flow Boiling Condensation Experiment's (FBCE) Module (FBM) vertical upflow configuration Earth gravity using same experimental system that was l...
Unification of the global vertical datum has been a key problem to be solved for geodesy over long period, and main challenge unifying system is determine geopotential value W0 geoid calculate offset between local W0. The can calculated using grid mean sea surface (GMSS) data model (GGM). In this study, GMSS was measured with adjustment methods 24 years merged multi-satellite altimetry data. Ha...
This study reports the oxidation behavior of a Ni-based alloy used in manufacture valve seats for automotive engine exhaust systems. Isothermal thermogravimetric analyses were carried out at temperatures 660, 740, 860, and 900 °C under an oxygen atmosphere up to 1 h. At 660 740 °C, only one stage was observed during whole time studied. this stage, oxide layer formed mainly by NiO + Cr2O3, follo...
evaluation of twisted tapes performance in enhancement of condensing heat transfer and pressure drop
in this research, heat transfer enhancement and simultaneous effect of that on pressure drop inside condensers with twisted tape inserts are investigated. a refrigeration system is designed for attaining to maximum level of heat transfer with minimum pressure drop. the test condenser is a double pipe heat transformer with inner and outer diameter of 10.7mm and 12.7mm for internal pipe, respecti...
مقدمه: مدلسازی روابط متغیرهای فرآیند خشککردن محصولات غذایی و بررسی سینتیک انتقال جرم و ضرایب نفوذ رطوبت میتواند بهعنوان یک ابزار سودمند برای کنترل بهینه فرآیند و بهبود کیفیت محصول خشکشده نهایی باشد. میوه کیوی دارای طعم و آرومای مطلوب بوده و دارای ارزش تغذیهای بالایی میباشد. مواد و روشها: در این پژوهش تأثیر توان لامپ پرتودهی در سه سطح 200، 250 و 300 وات در فواصل 5، 10 و 15 سانتیمتری از...
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