A. through empty space B. by the movement of fluids C. through direct contact D. by E. lectromagnetic waves 相关知识点: 试题来源: 解析 C。解析:热传导是通过直接接触发生的。选项 A,通过空的空间是热辐射。选项 B,通过流体的运动是热对流。选项 D,通过电磁波是热辐射的一种方式。阅读中要注意对...
That means not only metallic, and quasimetallic contact spots contribute to the heat transfer but also contact spots covered by the corrosion layer and air-filled gaps in-between (Figure 3) [10,11]. Heat exchange by conduction occurs if particles directly touch each other. In gases, the ...
When the Rayleigh number is small (typically <103), the convection is negligible and most of the heat transfer occurs by conduction in the fluid. For a larger Rayleigh number, heat transfer by convection has to be considered. When buoyancy forces are large compared to viscous forces, the regi...
Conduction heat transfer is an energy transfer mechanism in which the thermal energy is transferred from more energetic to less energetic neighboring particles. Conduction occurs in solids, liquids, and gases. In solids, the energy transfer occurs due to lattice molecular vibrations as well as movemen...
Heat transfer occurs when heat is passed from one object to another. There are three different methods of heat transfer. Those methods are conduction, convection, and radiation. What are three examples of conduction? Conduction happens when objects of different temperatures come into contact. For ex...
Infrared thermography is based on the measurement of radiative heat flow and is therefore most closely related to the radiation mode of heat transfer.…Radiative heat transfer is unlike the other two modes in several respects: 1. It can take place across a vacuum. 2. It occurs by ...
CONDUCTION--Conduction is the transfer of heat between substances that are in direct contact with each other. The better the conductor, the more rapidly heat will be transferred. Metal is a good conduction of heat. Conduction occurs when a substance is heated, particles will gain more energy, ...
This is heat transfer by conduction ? Energy travels up the spoon from the end in the hot soup to the end in your hand Conduction ? We sense the movement of energy by the increasing temperature ? This means the atoms and molecules have higher average ic energy ? Primarily occurs by the ...
The heat transfer by conduction through the membrane is ignored in the VMD configuration [39,73]; so the heat transfer across the VMD can be written as (3.45)hfTf−Tf,m=J△Hv The heat transfer coefficients of the boundary layers can be estimated by the Nusselt correlation (Table 3.5). ...
Heat is transferred by conduction to the handle, which then becomes warmer. Convection is a form of heat transfer that occurs when particles with a high heat content are mixed with cold particles and transfer their heat to the latter by conduction (Figure 6.1.4). Convection consequently ...