这是小管径、低流速系统测量方法上的一个突破。

We think this is an important break-through in testing lower flow velocity in tiny tube .

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为了防止测压管嘴被微细颗粒堵塞，在管嘴处以低流速向床内注入气体。

To prevent clogging of the pressure tap by fine solids gas is bled into the bed at low velocity at the taps .

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结果表明：在相同的管、壳程流速下热流体在壳程时换热器总传热系数比热流体在管程时相对高出约33%。

The results showed that the total heat transfer coefficient of heat exchanger with hot water arranged in shell-side was relatively higher by 33% than that with hot water arranged in tube-side.

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