Experimental investigation was conducted on the cooling tower test device using the outlet water temperature as evaluation index. The experimental results indicated that: the outlet water temperature decreased with th...
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Experimental investigation was conducted on the cooling tower test device using the outlet water temperature as evaluation index. The experimental results indicated that: the outlet water temperature decreased with the increase of air-to-water ratio, but the trend was decreasing gradually. The limit air-to-water ratio existed during the decrease of outlet water temperature. The outlet water temperature had little change when the air-to-water ratio was up to this value. The limit air-to-water ratio decreased with the increase of inlet air dry bulb temperature and wet bulb temperature, and increased with the increase of inlet water temperature. And the limit air-to-water ratio decreased with the increase of the flow rate of circulating water. Such conclusions may be advantageously used in guiding the design and operation of cooling tower.
The liquid kinematic viscosity of the binary mixtures of methanol and castor oil are reported over the temperature range from 243~353 K made with a calibrated Ubbelohde-type capillary viscometer. The total experimenta...
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The liquid kinematic viscosity of the binary mixtures of methanol and castor oil are reported over the temperature range from 243~353 K made with a calibrated Ubbelohde-type capillary viscometer. The total experimental uncertainty is less than 1.06%. In addition, the results were correlated as a function of temperature as the kinematic viscosity equation of the binary mixtures. The absolute average deviation and the maximum deviation of the experimental results from the correlated equation are 1.11% and 3.31%, respectively.
A series of chemical reactions happen in the coal gasifier and as a result, high temperature syngas is obtained which contains a lot of solid granules. The high-temperature syngas must be cooled, because it can not be...
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A series of chemical reactions happen in the coal gasifier and as a result, high temperature syngas is obtained which contains a lot of solid granules. The high-temperature syngas must be cooled, because it can not be utilized directly. The opposed water spray cooling is not only effective, but also could dedust the syngas. In the present study, the CFD technique is used to investigate the effect of the opposed spray cooling in a gasifier. The Euler-Lagrange method is applied to deal with the syngas and the water droplets respectively. A non-dimensional parameter Temperature Non-uniform Factor (TNF) is defined to confirm the height of the cooling section. The simulated results match the designed data well. If water droplets with small diameters are used, the single-stage water spray cooling is more economic than the two-stage water spray cooling.
Pb2+ doped Cd0.2Zn0.8S and Cd0.8Zn0.2S were prepared with coprecipitation method. The results indicate that the valence band of Cd0.2Zn0.8S solid solution with wide band gap is heightened by the Pb 6s level hybridizat...
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Pb2+ doped Cd0.2Zn0.8S and Cd0.8Zn0.2S were prepared with coprecipitation method. The results indicate that the valence band of Cd0.2Zn0.8S solid solution with wide band gap is heightened by the Pb 6s level hybridization with valence band, and the photocatalytical hydrogen evolution ability is improved. When Pb2+ is doped in Cd0.8Zn0.2S solid solution with narrow band gap, it acts as a recombination center and is unable to improve water splitting activity of the catalyst. So the doping of Pb2+ is effective only for the semiconductor with wide band gap.
Clogging failure is common for microfilter utilizing the flat membrane structure. To reduce clogging failure in microfilters, the turbine blade-like micropillar is introduced in microfilter design. Two improved cross-...
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Synthesis of solid solution ZnS-CuInS2 has been demonstrated. The crystallinity and stability of catalysts were highly improved by the combination of two usual ways used for improving the crystallinity of materials-ca...
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Synthesis of solid solution ZnS-CuInS2 has been demonstrated. The crystallinity and stability of catalysts were highly improved by the combination of two usual ways used for improving the crystallinity of materials-calcination at high temperature or hydrothermal, so was the activity of photocatalytic splitting water for hydrogen production. The catalysts were characterized by XRD, BET, SEM, XRF and UV-Vis. The results of the photocatalytic hydrogen production showed that the catalyst had the highest stability and activity by H2S inflowing to the metal cation solution following with calcination and hydrothermal. After the catalyst was loaded with 3% Pt, the velocity of hydrogen production has been further improved to 127 μmol/h. And its apparent quantum efficiency at 420 nm was up to 4.43%.
An experimental study of the shape of a single bubble similar to those observed in horizontal plug/slug flow was performed by visual observation and conductance probes in this paper. The results show that the shape of...
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An experimental study of the shape of a single bubble similar to those observed in horizontal plug/slug flow was performed by visual observation and conductance probes in this paper. The results show that the shape of the nose and body of bubble depends on the Froude number defined by gas/liquid mixture velocity, whereas the shape of the back region of bubble depends on both the Froude number and bubble length. The photographic pictures show that the motion of bubble is related to the characteristics of bubble head and the transition from plug flow to slug flow occurs when the back of the bubble changes from staircase to hydraulic jump pattern with increasing the Froude number and bubble length.
The numerical simulation technique was employed to study the flow and heat transfer performance of the rotating cooling channel with feed chamber and impingement chamber. The discharge coefficient of the impingement h...
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The numerical simulation technique was employed to study the flow and heat transfer performance of the rotating cooling channel with feed chamber and impingement chamber. The discharge coefficient of the impingement holes and the average Nusselt number of the impingement target surface in the blade leading edge in rotating were obtained. The result shows that the Coriolis force induced by the rotation effect can change the discharge coefficient of the impingement holes. With the increase of the rotating speed, the Coriolis force effect becomes more obvious. The discharge coefficient increases with the increase of rotating Reynolds number and outflow ratio, and decreases with the increase of the inlet Reynolds number. The influence of the rotation on the average Nusselt number of the impingement target surface is not obvious. With the increase of the rotating speed, Nusselt number increases slightly only at high rotating speed.
Carbon nitride-based photocatalysts hold an enormous potential in producing hydrogen.A strategy to simultaneously create isotype heterojunctions and active sites in highly-crystallized carbon nitride is anticipated to...
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Carbon nitride-based photocatalysts hold an enormous potential in producing hydrogen.A strategy to simultaneously create isotype heterojunctions and active sites in highly-crystallized carbon nitride is anticipated to significantly boost the photocatalytic activity,but is yet to be ***,we find that cobalt salt added in the ionothermal synthesis can promote the phase transition of heptazine-based crystalline carbon nitride(CCN)to triazine-based poly(triazine imide)(PTI),rendering the creation of singleatom cobalt coordinated isotype CCN/PTI ***-CCN/PTI exhibits an appreciable apparent quantum yield of 20.88%at 425 nm for photocatalytic hydrogen production with a rate achieving3538μmol h^(-1)g^(-1)(λ>420 nm),which is 4.8 times that of CCN and 27.6 times that of *** high photocatalytic activity is attributed to the Type II isotype highly-crystallized CCN/PTI heterojunction for promoting charge carrier migration,and the single-atom Co sites for accelerating surface oxidation reaction.
The widespread deployment of data centers has contributed to a dramatic increase in energy consumption and carbon emissions. To solve this problem, this study proposes a distributed multi-energy system (DMES) driven b...
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