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排序方式: 共有259条查询结果,搜索用时 15 毫秒
31.
LIQUID FLOW OVER DISTILLATION COLUMN PLATES 总被引:4,自引:0,他引:4
Hideto Yoshida 《Chemical Engineering Communications》1987,51(1):261-275
The liquid flow field over a bubble-cap tray or a perforated plate in distillation columns was determined numerically using the upwind difference method. The results of the numerical calculations indicate that with flow over such a plate there exists a stagnant region along the side of the plate, which expands with the increase in the Reynolds number. Furthermore, the size of the stagnant region depends upon the inlet liquid velocity distribution and is at a minimum when the distribution is uniform. It was also found that by installing baffles, the size of the stagnant region may be significantly reduced. 相似文献
32.
Hideto Yoshida Nonot Soewarno Takanori Nakamoto Masahiro Yorizane 《Chemical Engineering Communications》1986,43(4):263-274
Effect of baffle on a tray under oscillating conditions has been examined experimentally. To reduce the degree of liquid mixing and liquid channeling under oscillating conditions, it is necessary to install the baffles on tray.
Experiments were conducted with the air-water system, ft was found that the pressure drop change can be expressed as a sinusoidal function and the period coincides with tray oscillation. The degree of liquid mixing decreases when the baffles are installed on tray and it also decreases with the increase of liquid flow rate. The pressure drop increases with the installation of baffle on tray.
The suitable baffle number on tray is from 4 to 8 and in this region, the degree of liquid mixing reaches minimum and the liquid holdup takes a maximum value. @KEYWORDS: Tray, Oscillating, Liquid mixing, Baffle, Pressure drop, Liquid holdup. 相似文献
Experiments were conducted with the air-water system, ft was found that the pressure drop change can be expressed as a sinusoidal function and the period coincides with tray oscillation. The degree of liquid mixing decreases when the baffles are installed on tray and it also decreases with the increase of liquid flow rate. The pressure drop increases with the installation of baffle on tray.
The suitable baffle number on tray is from 4 to 8 and in this region, the degree of liquid mixing reaches minimum and the liquid holdup takes a maximum value. @KEYWORDS: Tray, Oscillating, Liquid mixing, Baffle, Pressure drop, Liquid holdup. 相似文献
33.
Hideto Matsuo 《Journal of Nuclear Materials》1980,92(1):39-42
This report describes an investigation of the effect of residual strain caused by compressive pre-stressing on the thermal conductivity of nuclear graphite. The structural changes caused by the applied stress were investigated by measuring the alteration in bulk and nitrogen displacement densities. In the range of small residual strains, the thermal conductivity increases as do the bulk and nitrogen displacement densities. For larger values of the residual strain (after stressing up to ~90% of the fracture stress) the thermal conductivity decreases approximately to its original value, while the bulk and nitrogen displacement densities continue to increase. These observations are compatible with some degree of crack formation; however, other data do not entirely support this simple picture. 相似文献
34.
The effects of incorporated poly(d-lactic acid) (PDLA) as poly(lactic acid) (PLA) stereocomplex crystallites on the isothermal and non-isothermal crystallization behavior of poly(l-lactic acid) (PLLA) from the melt were investigated for a wide PDLA contents from 0.1 to 10 wt%. In isothermal crystallization from the melt, the radius growth rate of PLLA spherulites (crystallization temperature (Tc)≥125 °C), the induction period for PLLA spherulite formation (ti) (Tc≥125 °C), the growth mechanism of PLLA crystallites (90 °C≤Tc≤150 °C), and the mechanical properties of the PLLA films were not affected by the incorporation of PDLA or the presence of stereocomplex crystallites as a nucleating agent. In contrast, the presence of stereocomplex crystallites significantly increased the number of PLLA spherulites per unit area or volume. In isothermal crystallization from the melt, at PDLA content of 10 wt%, the starting, half, and ending times for overall PLLA crystallization (tc(S), tc(1/2), and tc(E), respectively) were much shorter than those at PDLA content of 0 wt%, due to the increased number of PLLA spherulites. Reversely, at PDLA content of 0.1 wt%, the tc(S), tc(1/2), and tc(E) were longer than or similar to those at PDLA content of 0 wt%, probably due to the long ti and the decreased number of spherulites. This seems to have been caused by free PDLA chains, which did not form stereocomplex crystallites. On the other hand, at PDLA contents of 0.3-3 wt%, the tc(S), tc(1/2), and tc(E) were shorter than or similar to those at PDLA content of 0 wt% for the Tc range below 95 °C and above 125 °C, whereas this inclination was reversed for the Tc range of 100-120 °C. In the non-isothermal crystallization of as-cast or amorphous-made PLLA films during cooling from the melt, the addition of PDLA above 1 wt% was effective to accelerate overall PLLA crystallization. The X-ray diffractometry could trace the formation of stereocomplex crystallites in the melt-quenched PLLA films at PDLA contents above 1 wt%. This study revealed that the addition of small amounts of PDLA is effective to accelerate overall PLLA crystallization when the PDLA content and crystallization conditions are scrupulously selected. 相似文献
35.
Centrifuge model test of tunnel face reinforcement by bolting 总被引:5,自引:0,他引:5
Hirohisa Kamata Hideto Mashimo 《Tunnelling and Underground Space Technology incorporating Trenchless Technology Research》2003,18(2-3):205
Typical auxiliary bolting methods were tested using centrifugal models with sandy ground to confirm their strengthening effects on tunnel faces. Face bolting, vertical pre-reinforcement bolting and forepoling were tested separately, in various arrangements. Also, the experimental results were compared with the analytical results by the Distinct Element Method (DEM). Experimental results demonstrate that each bolting technique has an optimum length and arrangement to perform effectively. DEM modeling with a staggered block pattern was used to stimulate the failure states observed in the experiment. The effect of the bolting obtained from the experimental results was also confirmed by numerical simulations. 相似文献
36.
Trans‐fatty acid promotes thrombus formation in mice by aggravating antithrombogenic endothelial functions via Toll‐like receptors
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Kensuke Kondo Tatsuro Ishida Tomoyuki Yasuda Hideto Nakajima Kenta Mori Nobuaki Tanaka Takeshige Mori Tomoko Monguchi Masakazu Shinohara Yasuhiro Irino Ryuji Toh Yoshiyuki Rikitake Kazunobu Kiyomizu Yoshiaki Tomiyama Junichiro Yamamoto Ken‐ichi Hirata 《Molecular nutrition & food research》2015,59(4):729-740
37.
We present a two-dimensional simulation model to explore cake formation in cross-flow filtration. The model uses the lattice Boltzmann method (LBM) for fluid computation and the discrete element method (DEM) for particle computation; they were fully coupled with the smoothed profile method. We verified our model by simulating filtration under different transmembrane pressures. We then investigated the effects of attractive forces and particle concentration on the cake formation mechanism. Generally, as the attractive interaction and particle concentration increased, the particles formed a cake layer with a looser body and rough surface, due to the decrease in the mobility of the particles in contact with the cake surface. It is concluded that the effects of particle concentration are affected by the different conditions of attractive interactions between the particles. 相似文献
38.
Poly(L -lactide) (PLLA) and poly(DL -lactide) (PDLLA) blends were crystallized from the melt and their crystallization behaviors and morphologies were investigated using differential scanning calorimetry and polarizing microscopy. PLLA could crystallize from the melt in the presence of PDLLA when the PLLA content in the blend (XPLLA) was higher than 0.2. Spherulites were formed when XPLLA was between 0.6 and 1. The radius of the spherulites formed in the presence of PDLLA was larger than that of nonblended PLLA, probably because the coexisting PDLLA reduced the density of nuclei for the spherulites. Small crystallite assemblies were formed when XPLLA was between 0.2 and 0.5, and grew spherically from the nuclei when XPLLA was 0.5. Isotactic PLLA and atactic PDLLA seem to be miscible prior to crystallization, but PDLLA will be trapped between the lamellae of the spherulites or spherulitic assemblies during crystallization. PDLLA delayed the induction for crystallization of the blends. In spite of different morphology, the melting temperature and crystallinity of PLLA remained virtually constant when annealing was conducted for 600 min at XPLLA between 0.5 and 1. © 1995 John Wiley & Sons, Inc. 相似文献
39.
Hideto Matsuyama Kazuhiro Ohga Taisuke Maki Masaaki Tearamoto Shuji Nakatsuka 《应用聚合物科学杂志》2003,89(14):3951-3955
Microporous cellulose acetate membranes were prepared by a thermally induced phase separation (TIPS) process. Two kinds of cellulose acetate with acetyl content of 51 and 55 mol % and two kinds of diluents, such as 2‐methyl‐2,4‐pentandiol and 2‐ethyl‐1,3‐hexanediol, were used. In all polymer‐diluent systems, cloud points were observed, which indicated that liquid–liquid phase separation occurred during the TIPS process. The growth of droplets formed after the phase separation was followed using three cooling conditions. The obtained pore structure was isotropic, that is, the pore size did not vary across the membrane. In addition, no macrovoids were formed. These pore structures were in contrast with those usually obtained by the immersion precipitation method. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 3951–3955, 2003 相似文献
40.