When fluid currents are produced by external sources , the solid-to-fluid heat transfer is termed .
A: free convection
B: natural convection
C: forced convection
A: free convection
B: natural convection
C: forced convection
C
举一反三
- Which of the following options has effects on convection heat transfer: A: The surface condition for heat transfer. B: Whether chemical reactions occur during the mixed flow of multiple fluids. C: The type of fluid. D: Whether the fluid flow is driven by external power.
- The mechanisms by which the heat may flow are three: conduction, convection, and radiation.
- Radiation heat transfer of smoke tube boiler mainly occurs in , convection heat transfer mainly occurs in . A: Furnace and smoke pipe B: Smoke pipe and furnace C: Needle tube, smoke box D: Smoke box and smoke pipe
- Which of the following is not the way of heat loss? () A: Shivering B: Radiation C: Conduction D: Convection E: Evaporation
- The thermal conductivity of the insulation material outside the tube is 0.08W/m.K. The convection heat transfer coefficient outside the tube is 8W/m2.K. What is the critical insulation diameter of the tube? A: 20m B: 2m C: 0.2m D: 0.02m
内容
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传热的基本方式有（ ）（Conduction）、热对流（Convection）和热辐射（radiation）
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传热的基本方式有（ ）（Conduction）、热对流（Convection）和热辐射（radiation）
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When the system vibrates in a fluid medium, the damping is ( )a)Viscous b) Columb c)Solid d)Fluid A: None B: None C: None D: None
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万能蒸烤炉的基本功能有 。 A: steaming B: roasting C: convection D: frying
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Birds orient themselves carefully with regard to the sun and gently ________ their wings to increase convection (气流对流) cooling.