Heat Transfer Analysis of Engine Cylinder Fins Having Triangular Shape
Indian two-wheeler market is the world’s second biggest market. Among the three segments (motorcycles, scooters and mopeds) of the Indian two wheeler market, major growth trends have been seen in the motorcycle segment over the last four to five years due to its resistance and balance even on bad road conditions. In Indian motorcycles, Air-cooling is used due to reduced weight and simple in construction of engine cylinder block. As the air-cooled engine builds heat, the cooling fins allow the wind and air to move the heat away from the engine. Low rate of heat transfer through cooling fins is the main problem in this type of cooling. The Engine cylinder is one of the major automobile components, which is subjected to high temperature variations and thermal stresses. In order to cool the cylinder, fins are provided on the surface of the cylinder to increase the rate of heat transfer. By doing thermal analysis on the engine cylinder fins, it is helpful to know the heat dissipation inside the cylinder. The principle implemented in the project is to increase the heat dissipation rate by using the invisible working fluid, nothing but air. We know that, by increasing the surface area we can increase the heat dissipation rate, so designing such a large complex engine is very difficult. The main purpose of using these cooling fins is to cool the engine cylinder by air. The main aim of the project is to analyze the thermal properties by varying geometry, material of cylinder fins.
There are three basic mechanisms of heat transfer which are often referred as modes of heat transfer. These are conduction, convection and radiation. All the energy transfer that takes place in the form of heat is either any one or a combination of these.
It is most common approach to enhance the Heat transfer by using the extended surfaces. A plain fin may increases the surface area but a special shape extended surface may increase heat transfer coefficient in addition to the heat exchanger. The extended surfaces for liquids typically use much smaller fin heights than that used for gases because of the higher heat transfer coefficient for liquids. Use of high fins with liquids would result in low fin efficiency and result in poor material utilization. Externally finned tube and internally finned tube are tha examples of extended surfaces for liquids.
The temperature distribution, rate of heat transfer and fin effectiveness for six common profiles of longitudinal fins are given below. The analytical expressions given for these profiles are based on the following assumptions:
1. The heat conduction in the fin is steady and one dimensional.
2. The fin material is homogeneous and isotropic.
3. There is no energy generation in the fin.
4. The convective environment is characterized by a uniform and constant heat transfer coefficient and temperatures.
5. The fin has a constant thermal conductivity.
6. The contact between the base of the fin and the primary surface is perfect.
7. The fin has a constant base temperature.
1. Fins are commonly used as heat management in electrical appliances.
2. Condensers in Refrigeration and Air Conditioning.
3. Engine Cooling.
4. Thin plate of fins of Car Radiator
5. Heat exchanger in power plant
6. Most effective in application where heat transfer coefficient (h) is low.
7. Nature has also taken advantage of the phenomena of fins. The ears of jackrabbits and fennec foxes act as fins to release heat from the blood that flows through them.
8. In old times say Dinosaur time, Fins are on the backside of the Dinosaur.
9. Fins are also used in automobiles like engine cylinder with fins.
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