超声振动减小了接触面的有效接触面积；
The ultrasonic vibration changes the friction status between the contact surfaces, and decreases the factual contact area.
如果人体组织和电极之间的有效接触面积保持不变，那么高频电流强度扩大一倍将会使电流密度增大一倍，并产生四倍的热量。
Doubling hf-current results in a doubling of current density and a fourfold heat provided that the area of effective contact between the tissue ang the electrode remains constant.
为此采用拟双重介质模型模拟该类油藏：好储层对应裂缝系统，差储层对应基岩系统，但双重介质间窜流量考虑了储层之间的有效接触面积。
Therefore dual medium model was used for the reservoir simulation, where good reservoir was corresponded to fracture system and poor reservoir was to matrix system.
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