题目内容

Which of the shell and tube heat exchanger is easier to scale, helical baffles or segmental baffles?

A. Helical baffles
B. Segmental baffles
C. Same
D. Can not be determined

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Which of the following methods cannot be used to reduce the thermal resistance of fouling inside the tube

A. Decrease water velocity
B. Increase water velocity
C. Add chemical cleaning substances to the fluid
D. Use ultrasonic sound field to treat the fluid

In the steady-state heat transfer, the temperature difference is constant. In order to increase the heat transfer, which of the following methods cannot be used?

A. Increase heat transfer area
B. Increase heat transfer thermal resistance
C. Increase the heat transfer coefficient
D. Increase convective heat transfer

To enhance the single-phase forced convection heat transfer on the air side, the commonly used methods generally do not include:

Additional fins
B. Increase the roughness of heat transfer surface
C. Use longitudinal vortex generator
D. Use high-fin tubes

Which of the following is not an effective measure to enhance heat transfer?

A. Corrugated tube
B. Micro-fins
C. Smooth tube
Dimpled turfaces

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