This morning I ran to the hospital and had my body test.there were so many people in the hospital and I spent two hours on the lineup.I felt so hungry and I ate a meat cake. I have to bring my report tomorrow. I will finish the two script plans as soon as possible.finghting! I will get more script [兔子][兔子][兔子]

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).

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