接触角测试技术及粗糙表面上接触角的滞后性 Ⅱ:粗糙不锈钢表面接触角的滞后性  

Measuring Technique of Contact Angle and Contact Angle Hysteresis on Rough Solid Surfaces Ⅱ: Contact Angle Hysteresis on Rough Stainless Steel

作　　者：王晓东[1] 彭晓峰[1] 陆建峰[1] 王补宣[1] 

机构地区：[1]清华大学热能工程系,北京100084

出　　处：《应用基础与工程科学学报》2003年第3期296-303,共8页Journal of Basic Science and Engineering

基　　金：国家自然科学基金(No.59976016);国家"973"重大基础研究项目资助(No.G2000026301)

摘　　要：应用躺滴法结合CCD数字影像技术研究粗糙不锈钢表面上的接触角滞后现象.结果表明:随表面粗糙度的增加,前进接触角增大,后退接触角减小,滞后性增加,且以90°的Young接触角为界,前进接触角和后退接触角随表面粗糙度的变化趋势不同;同时滞后性随液相表面张力的增加而增强.这些实验结果和观察与此前提出的滞后张力模型预测一致,实际表面接触角滞后现象的研究对于推动气液相变的诸多子过程的深入理解具有十分重要的意义.By employing the sessile drop method combining with CCD camera and the digital image technique, the contact angle hysteresis of the distilled water, the diethylene glycol and 1butyl alcohol on stainless steel flat surfaces was measured. The experimental results show that the advancing contact angle increases, receding contact angle decreases and the hysteresis increases, as the roughness of the solid surface increases. When θY<90°, the decreasing value of the receding contact angle is larger than the increasing value of the advancing contact angle; when θY<90°, the decreasing value of the receding contact angle is less than the increasing value of the advancing contact angle; only when θY=90°, there exists the barrier effect proposed by the literature \. The results of the experiments well accord with the predictions of the hysteresis tension presented by Wang and Peng. 

关 键 词：接触角 测试 滞后性 躺滴法 滞后张力 粗糙不锈钢表面 传热 

分 类 号：TG111[金属学及工艺—物理冶金] TG142.71[金属学及工艺—金属学]