Mechanical Engineering Exam > Mechanical Engineering Videos > Heat Transfer > Numerical on Free Convection - 1
Numerical on Free Convection - 1 Video Lecture | Heat Transfer - Mechanical Engineering
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FAQs on Numerical on Free Convection - 1 Video Lecture - Heat Transfer - Mechanical Engineering
| 1. What is free convection in chemical engineering? |  |
Ans. Free convection in chemical engineering refers to the process of heat transfer that occurs due to the natural movement of fluid caused by temperature differences. In this phenomenon, the fluid near a hot surface becomes less dense and rises, while the cooler fluid descends to take its place. This convection process plays a crucial role in various chemical engineering applications, such as heat exchangers, cooling towers, and distillation columns.
| 2. How is free convection different from forced convection? | |
Ans. Free convection and forced convection are both methods of heat transfer, but they differ in the way fluid motion is induced. In free convection, the motion of the fluid is natural and caused by temperature differences, whereas in forced convection, an external force, such as a fan or a pump, is used to create fluid motion. Forced convection is commonly used in applications where higher heat transfer rates are required, while free convection is more prevalent in natural systems or situations where forced convection is not feasible.
| 3. What factors influence the rate of free convection heat transfer? | |
Ans. Several factors affect the rate of free convection heat transfer. These include the temperature difference between the surface and the fluid, the physical properties of the fluid (such as viscosity and thermal conductivity), the geometry and orientation of the surface, and the presence of any obstacles or obstructions that may impede the fluid flow. Additionally, the gravitational force and the buoyancy effects also play a significant role in free convection heat transfer.
| 4. How can free convection be enhanced in chemical engineering processes? | |
Ans. Free convection heat transfer can be enhanced in chemical engineering processes by various means. One approach is to increase the temperature difference between the surface and the fluid, which promotes more significant buoyancy-driven fluid flow. Modifying the surface geometry, such as adding fins or roughness elements, can also increase the convective heat transfer area and enhance the heat transfer rate. Additionally, using forced convection techniques like employing fans or pumps can also augment the fluid motion and improve free convection heat transfer.
| 5. What are the advantages of free convection in chemical engineering applications? | |
Ans. Free convection offers several advantages in chemical engineering applications. Firstly, it is a natural and passive method of heat transfer, requiring no external energy input. This can result in energy savings and reduced operating costs. Secondly, free convection is often more suitable for delicate or sensitive processes where forced convection may cause disruption or damage. Lastly, free convection can provide uniform heat distribution and reduce the formation of hot spots, ensuring efficient and safe operation in various chemical engineering systems.
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Nov 23, 2024 Last updated |
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