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The Weissenberg number (Wi) is a dimensionless number used in the study of viscoelastic flows. It is named after Karl Weissenberg. The dimensionless number compares the elastic forces to the viscous forces. It can be variously defined, but it is usually given by the relation of stress relaxation time of the fluid and a specific process time. For instance, in simple steady shear, the Weissenberg number, often abbreviated as Wi or We, is defined as the shear rate {\displaystyle {\dot {\gamma }}}{\displaystyle {\dot {\gamma }}} times the relaxation time {\displaystyle \lambda }\lambda . Using the Maxwell model and the Oldroyd-B model, the elastic forces can be written as the first Normal force (N1).

每次Wx不到我，2秒后家里电话响起，家里电话没法静音的。我妈第1句话总是怎么不接WX？每次我都解释人不在手机边，看不见信息的。我想blame苹果公司，你倒是一站式发明啊把手机植入人体内算了。经过亲戚对他心水公司的介绍，我也没那么喜欢苹果还有巴菲特了，听billable hour rate 7千元说的跟上就是了．
这不同于我友的分析strategy，我友只喜欢上市公司家里的钱，不是发心于个人好恶。他主要派自己老婆打入内部，得知一些吃瓜残片，再吐给我们一群小的（又称靓，广东话的马仔）。吃的最起劲就是我[吃瓜][吃瓜][吃瓜][吃瓜][吃瓜] 假期还给我们安排了功课，这人一看面相就[委屈]