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Zhang Hongjing Zhou Zhaoyi 《保鲜与加工》1997,(2):123-127
This paper presents a detail study of bubble coalescence in inorganic salts and organic compounds of fermented solution ,and preliminary analyses the principle of bubble coalescence.The experiments show that the relationship between the solute concentration and coalescence frequency reveals the existence of sharp transition concentration. 相似文献
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GUO Chao ZHANG Yong-xing LUO Jun-cai ZHOU Zhi-ming ZHANG bo-hu LI Jin-long XIE Wen-ting WU De-jun 《保鲜与加工》2011,(4):106-112
By using near crack line analysis method and Mohr-Coulomb strength criterion,the elastic-plastic solution for near crack line of an eccentric cracks loaded by the pore water pressure under large scale yielding condition is analyzed.The elastic stress fields,the plastic stress field,the unit normal vector of the elastic-plastic boundary near the crack line,the elastic-plastic stress fields near crack line are identified.The change pattern of the length of the plastic zone and the pore water pressure is presented.Besides,the elastic-plastic analytical solution for an eccentric cracks loaded by the pore water pressure is obtained. 相似文献
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旋流气液分离器能够实现高气速、高气液比工况下的气液分离,从而满足降本增效的要求。通过调研国内外水下旋流气液分离器的研究成果,对不同类型的水下旋流气液分离器进行了重点评述,从旋流场内液滴破碎机理、分离器内部流场参数等方面论述了水下旋流气液分离器的理论研究进展。结合工程实际需求,提出了水下旋流气液分离器研究中的不足及其未来的研究方向:建立水下旋流气液分离器的独立设计准则;进一步完善液滴在旋流场中破碎与聚合的理论研究;将旋流气液分离器与其他形式的分离器相结合,形成综合性的分离系统。 相似文献
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反胶束萃取大豆蛋白反萃取过程的动力学研究 总被引：2，自引：0，他引：2
该文通过系统地研究影响总传质系数的各个主要因素（水相pH值、离子强度，初始有机相中蛋白质浓度、振荡速度和反萃取温度）,探讨了以丁二酸二异辛酯磺酸钠(AOT)/异辛烷反胶束体系反萃取大豆蛋白的动力学。结果表明，大豆蛋白反萃取过程中总传质系数，随着反萃取水相的pH值和温度的升高而增大；随着离子强度的增大而先增大后减小；随着振荡速度和初始有机相中蛋白质浓度的增大而几乎不变。说明在反萃取过程中，大豆蛋白在有机相和水相两相内的扩散阻力可以忽略，界面阻力是传质过程中的主要阻力。由此推断出大豆蛋白的反萃取过程属于界面控制类型，“满胶束”在界面上的聚结过程是反萃取的速率控制步骤。通过研究，深入了解了大豆蛋白反萃取过程的机理，可有效地控制和强化萃取过程，提高萃取率，为今后的研究提供可靠的基础数据和理论依据。 相似文献
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为了揭示电破乳中的液滴电聚结特性,考虑液滴变形,采用液滴静电偶极模型对电场作用下油中两相临水滴的聚结过程进行了模拟及试验研究。模拟及试验结果表明,模型对水滴间距随时间的演化预测与试验结果较为相符,平均相对误差为25.95%。液滴聚结的效果主要受两液滴因静电吸引而产生的相对运动速度及液滴的变形程度所支配。当电场强度增大时,液滴相对运动加快,液滴变形加剧,液滴聚结效率提高。结果还表明,连续相黏度及水滴尺寸对液滴聚结有显著影响。连续相黏度增大,液滴运动阻力变大,两液滴相向运动减慢,液滴聚结效果变差;离散水滴直径增大,静电吸引力增强,液滴运动加快,此外,大液滴更容易产生变形,故具有大尺寸离散液滴的乳化液电聚结效果更好。研究结果为电破乳器设计及操作参数优化提供参考。 相似文献
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Caroline Onfroy Alain Baranger Bernard Tivoli 《European journal of plant pathology / European Foundation for Plant Pathology》2007,119(1):13-27
The expression of partial resistance in pea to ascochyta blight (caused by Mycosphaerella pinodes) was studied in a detached stipule assay by quantifying two resistance components (fleck coalescence and lesion expansion)
using the method of point inoculation of stipules. Factors determining optimal conditions for the observation of partial resistance
are spore concentration, the age of the fungal culture prior to spore harvest and the pathogenicity of the isolate used for
testing. Partial resistance was not expressed when spore concentration was high or when the selected isolate was aggressive.
Furthermore, assessments of components of partial resistance were highly correlated with disease severity in a seedling test.
A screening protocol was developed based on inoculations of detached stipules to study partial resistance in pea. To simplify
the rating process, a more comprehensive disease rating scale which took into account fleck coalescence and lesion expansion
was tested by screening a large number of genotypes. 相似文献
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