نتایج جستجو برای: causes a sharp drop in temperature
تعداد نتایج: 20456229 فیلتر نتایج به سال:
The experimental facility for pressure hydrogasification research was adapted to the pressure of 10 MPa and temperature of 1300 K, which ensured repeatability of results and hydrogen heating to the process temperature. A hydrogasification reaction of chars produced from two rank coals was investigated at temperatures up to 1173 K, pressures up to 8 MPa, and the gas flow rates of 0.5-5 dm(n)(3)/...
In this study, operation of compressor station has been investigated by exergy approach. Exergy analysis is a thermodynamic method which shows the irreversibility of a system quantitatively. Gas compressors are used to compensate the pressure drop along the gas pipeline significantly. The compression process causes temperature rise of gas; in this regard gas cooler is applied to reduce the temp...
The aim of this study is to experimentally investigate the effect of the coiled wire insertions on dynamic instabilities and to compare the results with the smooth tube for forced convection boiling. The experiments were conducted in a circular tube, and water was used as the working fluid. Two different pitch ratios (H/D = 2.77 and 5.55) of coiled wire with circular cross-sections were utilise...
( ) A nonmechanical pumping mechanism, thermocapillary pumping TCP , is described for mo®ing nanoliterand picoliter-sized drops of liquid within microfabricated flow channels. In TCP, one end of a single drop is heated to create a surface tension difference between the ends of the drop. The induced surface tension difference causes a capillary pressure difference between the two drop ends and r...
Wepresentmeasurements of the dissipative turbulent drag on a vibrating grid in superfluid 4He over awide range of (low) frequencies. At high velocities, the dissipative drag is independent of frequency and is approximately the same as that measured in normal liquid 4He. We present measurements on a similar grid in superfluid 3He-B at low temperatures which shows an almost identical turbulent dr...
The aim of the article is to present U.S. policy towards situation on border between Venezuela and Colombia in recent years. main reason for involvement was humanitarian crisis that area. causes migrant include Maduro regime’s curtailment democracy, sharp drop oil prices demand international markets, popular revolt. One consequences, besides obvious, ones, unfavorable from perspective security ...
Background: Alcohol is a substance that is consumed widely around the world. There are different interpretations regarding the effects of alcohol on athletic performance. Today, alcohol is introduced as a contributing factor for increasing athletic performance by some sport clubs. Methods: The purpose of this article is to investigate the effects of alcohol on athletic performance. PubMed, Scop...
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