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Difference between film and drop wise condenation?
Filmwise condensation occurs on 'wettable' materials as a formation of film on the surface,While dropwise condensation occurs on 'nonwettable' material as spherical drops form on the surface.These drops adhere together to become larger as condensation proceeds. Usually the heat transfer coefficient in dropwise is 5-8 times larger than that of filmwise condensation.Filmwise condensation is more common than the Dropwise condensation.
What is the difference between film and dropwise condensation?
Film condensation occurs when a continuous liquid film forms on a surface during the condensation process, while dropwise condensation occurs when discrete droplets form on the surface. Dropwise condensation is more efficient in heat transfer compared to film condensation due to reduced resistance to heat transfer at the liquid-vapor interface.
Which is better vertical or horizontal condenser?
Hi.. For only filmwise condensation, horizontal position gives higher condensation coefficent than verical position. In case of condensation with subcooling in a shell and tube heat exchanger, condensation coefficient is higher with horizontal postion while subcooling coefficient is higher with vertical position. kal....
Why saturated steam is used in exchangers frequently rather then superheated?
The heat transfer coefficient of superheated steam is poor. Saturated steam has a better heat transfer coefficient, and also most of the heat transferred from steam occurs because of the condensation phase change.
What is the convective heat transfer coefficient of water and how does it impact the rate of heat transfer in a system?
The convective heat transfer coefficient of water is a measure of how easily heat can move through water. A higher convective heat transfer coefficient means heat can transfer more quickly. In a system, a higher convective heat transfer coefficient can increase the rate of heat transfer, making the system more efficient at exchanging heat.
How does the resestance to heat transfer of the matrrial of the condenser pipe effect on the transfer coefficient?
The resistance to heat transfer of the material of the condenser pipe affects the overall heat transfer coefficient by increasing the overall thermal resistance. A higher resistance to heat transfer in the material of the condenser pipe will reduce the heat transfer coefficient, making heat transfer less effective. This can result in reduced efficiency in the condenser's operation.
Conductive heat transfer coefficient of ptfe?
12
What is Overall Heat transfer coefficient?
The overall heat transfer coefficient represents the rate at which heat is transferred between two mediums per unit area and per unit temperature difference. It combines the individual resistances to heat transfer in conduction, convection, and radiation into a single value. A higher overall heat transfer coefficient indicates a more efficient heat transfer process.
What is the difference between Drop wise condensation and film wise condensation?
heat transfer rate high
What is the heat transfer coefficient of water and how does it affect the efficiency of heat transfer processes?
The heat transfer coefficient of water is a measure of how well water can transfer heat. It is influenced by factors such as temperature, flow rate, and surface area. A higher heat transfer coefficient means that heat can be transferred more efficiently between water and another substance. This is important in heat transfer processes like cooling systems or heating systems, where efficient heat transfer is crucial for optimal performance.
What is the convective heat transfer coefficient of water and how does it affect heat transfer processes?
The convective heat transfer coefficient of water is a measure of how easily heat can transfer through water by convection. It represents the rate at which heat is transferred between a solid surface and water through the movement of fluid particles. A higher convective heat transfer coefficient means that heat can transfer more efficiently, leading to faster heat exchange processes. This coefficient is influenced by factors such as temperature, flow rate, and surface area, and plays a crucial role in various heat transfer applications, such as cooling systems and thermal management.
When F type mass transfer coefficients are preferred?
mass transfer coefficient in f&k type
