Author: workhouse123
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Convection
Convection is the term used for heat transfer mechanism which takes place in a fluid because of a combination of conduction due to the molecular interactions and energy transport due to the macroscopic motion of the fluid itself. In the above definition, the motion of the fluid is essential otherwise the heat transfer mechanism becomes…
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Conduction
Conduction is the heat transfer from one part of a substance to another part of the same substance, or from one substance to another in physical contact with it, without appreciable displacement of the molecules forming the substance. On the elementary particle level, the conduction is visualized as the exchange of kinetic energy between the…
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INTRODUCTION
This chapter deals with different modes of heat transfer which are usually classified as conduction, convection and radiation. From the second law of thermodynamics, we know that the heat flows whenever there is existence of temperature difference or temperature gradient. Heat is a form of energy which is transferred from one body to another body…
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DIFFERENCES BETWEEN FLYWHEEL AND GOVERNORS
Differences Between Flywheel and Governors Flywheel Governors It is provided on the engine and fabricating machines, viz., rolling mills, punching machines, shear machines, presses, etc.Its function is to store available mechanical energy when it is in excess of the load requirements and to part with the same when the available energy is less than…
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GOVERNING OF IC ENGINES
Governing is an action to control the fuel supply so that the engine runs at practically constant speed. When load on an engine increases the speed drops and when load decreases the speed increases. Thus to control the fluctuation in engine speed, fuel requirement increases during increasing load and fuel requirement decreases during decreasing load.…
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SENSITIVENESS OF GOVERNORS
A governor is said to be sensitive, if change of speeds from no load to full load may be as small a fraction of the mean equilibrium speed as possible and the corresponding sleeve lift may be as large as possible. Sensitiveness of a governor can be found by dividing the difference between maximum and…
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SPRING CONTROLLED CENTRIFUGAL GOVERNOR
14.7.1 Hartnell Governor The Hartnell governor is shown in Figure 14.7(a). The two bell crank levers are used which can rotate about fulcrums O and O′. One end of both bell crank lever carries a ball and a roller at the other end of the arm. The rollers make contact with the sleeve. A helical spring is mounted on the spindle…
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Proell Governor
The Proell governor has the balls at B and C to the extension of the links DF and EG, as shown in Figure 14.6(a). The arm PF and GQ are pivoted at P and Q, respectively. Consider the free body diagram of half of the governor as shown in Figure 14.6(b). The instantaneous centre (I) lies on intersection of…
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GRAVITY CONTROLLED CENTRIFUGAL GOVERNORS
14.6.1 Watt Governor This governor was initially used by James Watt in steam engine. The spindle is driven by the output shaft of the prime mover. The balls are mounted at the junction of the two arms. The upper arms are connected to the spindle and lower arms are connected to the sleeve as shown in Figure…
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CLASSIFICATION OF GOVERNORS
The classification of governors is shown in . Figure 14.3 Classification of Governors