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The desalination of brackishor sea wateris widelyap-plied to the water supply in China and around theworld[1—4]. The common desalination methods , such asmultistage flesh, multi-effect distillation and reverse osmo-sis, usually require high initial costs and skill oper-ation[5 ,6]. For this reason,these desalination techniquesare mostlyreliable for large capacity of fresh water produc-tion but not economical in the water-shortage areas wherewater demand is decentralized or proper infrastructu… 相似文献
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利用相分离法制备了亲水性聚偏氟乙烯（PVDF）-氯化锂共混膜,通过接触角测量和水蒸气吸附实验评价了膜的亲水性,并通过水蒸气渗透实验测试了总传质系数和水蒸气渗透速率.实验结果表明：随着铸膜液中氯化锂含量的增加,PVDF膜的接触角明显降低,同时,PVDF膜对水蒸气的吸附能力随之增加.当氯化锂质量分数低于2.5%时,水蒸气在膜中的总传质系数略有增加,当氯化锂质量分数高于2.5%时,总传质系数明显增加,而水蒸气在膜中渗透速率随氯化锂含量的增加而增加.因此,氯化锂的加入可以显著提高PVDF膜的亲水性,进而增强水蒸气的渗透性能. 相似文献
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The resonant behaviors of an ultra-sonic gas atomization nozzle with a zero mass-flux jet actuator were numerically investigated with FLUENT software by using a double precision unsteady two-dimensional pressure-based solver. The Spalart-Allmaras turbulence model was adopted in the simulations. Numerical results indicated that the oscillation properties of the gas efflux were effectively improved. Several resonatory frequencies corresponding to different vibration modes of gas were distinguished in the nozz... 相似文献
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横向气流中环状流射流液膜的破碎与雾化 总被引：1，自引：0，他引：1
针对环状流射流液膜在横流中破碎与雾化过程开展实验研究。研究发现,从宏观雾化形态看,环状流射流在横流中可以实现稳定的雾化;实验给出横流作用下环状流射流轨迹无量纲关联式。采用高速摄影技术对横流中环状流射流液膜破碎与雾化瞬态过程进行捕捉,发现环状流射流液膜雾化过程具有周期性和不连续性;不同环状流状态下液膜在横流中雾化机制有较大差异;增大射流表观气速能有效提升雾化效果。 相似文献
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奇偶指数与链烷烃原子化热的关系 总被引：3，自引：0，他引：3
在距离矩阵的基础上提出一种新的拓扑指数一奇偶指数OE,该指数对C1-C10的150个链烷烃有很好的结构区分性。将其对C1-C9的有关链烷烃的原子化热进行结构性质相关,结果表明,该指数具有良好的性质相关性。奇偶指数计算简便,有望作为一个重要参数在QSPR／QSAR研究中得到应用。 相似文献
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The high temperature heat pump and desiccant wheel(HTHPDW) system can make full use of heat released from the condenser of heat pump for DW regeneration without additional heat. In this study, DW operation in the HTHPDW system was investigated experimentally, and the optimization analysis of HTHPDW system was carried out. The performance of DW had influence on the dehumidification(evaluated by dehumidification and regeneration effectiveness) and cooling load(evaluated by thermal and adiabatic effectiveness). The results show that the enthalpy increase occurred in all the experiments. Compared to the isosteric heat, heat accumulation in the desiccant and matrix material and heat leakage from regeneration side to process side have greater influence on the adiabatic effectiveness. Higher regeneration temperature leads to lower adiabatic effectiveness that increases more cooling load of the system. When the regeneration temperature is 63℃, the maximal dehumidification effectiveness is 35.4% and the satisfied adiabatic effectiveness is 88%, which contributes to the optimal balance between dehumidification and cooling. 相似文献
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As a sanitary, reproducible and inexpensive en-ergy resource, the hydroelectric generation has beenincreasingly used in recent years. A great number ofhuge dams have been constructed in the narrow gor-ges, with the height of around 300 m and the flooddischarging powers ranging from10 billion to100 bil-lion W. The maximum unit discharges all exceed 200m3/(s·m). With the characteristics of flood dis-charge such as high head, large discharge, narrowgorges and high frequency, the existing dams ha… 相似文献
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农民原子化的后果及对策 总被引：4，自引：0，他引：4
20世纪的中国革命、市场经济以及家庭联产承包责任制的推行，动摇了农民一致行动的村庄基础，相互之间的合作越来越困难，农民日益原子化。农民成为分散和孤立的个体，无法为共同利益达成有效的合作，导致农民的市场竞争力下降、农民政治参与的积极性不高、农村公共物品供给出现严重不足等后果。农民只有组织起来才能摆脱不利的局面，国家应鼓励农民建立自己的组织。 相似文献