The basic current has the annual variation under the influences of solar radiation, earth's surface temperature and condensation heatings, all with an annual period.
其次，在具有年周期的太阳辐射、垫面温度及凝结加热的作用下，基本气流以年周期变化。
A heat mass transfer model is constructed to take the variation of the scaling layer surface temperature into consideration.
据此提出了考虑垢层表面温度变化的描述结垢过程的传热传质模型。
The results show that the variation of the scaling layer surface temperature is one of the major factors that cause the asymptotic tendency of scaling process.
结果表明，对恒壁温情况必须考虑垢层表面温度随时间的变化，这一变化是导致结垢过程渐近特性的重要原因之一；
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