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Descriptive Presentation on Pascal's Law (PPT)

• 2. S.No. TOPIC Page No. 1. Aim of Project 3 2. Introduction 4 3. History of Pascal’s law 5 4. Pascal’s Law 6 – 8 5. Applications 9 6. Hydraulic Lift 10 – 12 7. Hydraulic Brake 13 – 17 8. Conclusion 18 9. Bibliography 19 2
• 3. AIM OF PROJECT To study about Pascal’s Law:- • Its history and discovery • More about Pascal’s law  Its define Its mathematical derivation and expression • Applications of Pascal’s law  Hydraulic Lift  Hydraulic Brake 3
• 4. INTRODUCTION In this project we will see how Blaise Pascal, a French scientist, discovered Pascal’s Law. How is it used in fluid mechanics and daily life? Pascal’s law’s uses has been increased over time in scientific area as well as in daily life. It is very much used in places where there is a work of lifting heavy loads and applying same force at same time to multiple areas with a single lever. So, it is a very important law and we will know some basic concepts of it. 4
• 5. History Of Pascal’s Law Pascal's law was discovered by a French scientist Blaise Pascal during an experiment that was allegedly performed in the 1600's. A 10 m long pole was vertically inserted into a barrel that was filed with water. As the water was poured into the vertical tube, Pascal discovered that the pressure from the water caused the barrel to burst. 5
• 6. Pascal’s Law Pascal’s Law, also called Pascal’s Principle, in fluid (gas or liquid) mechanics, states that, in a fluid at rest in a closed container, a pressure change in one part is transmitted without loss to every portion of the fluid and to the walls of the container. This fact may be demonstrated in a simple way. 6
• 7. Figure shows an element in the interior of a fluid at rest. This element ABC-DEF is in the form of a right-angled prism. In principle, this prismatic element is very small so that every part of it can be considered at the same depth from the liquid surface and therefore, the effect of the gravity is the same at all these points. But for clarity we have enlarged this element. The forces on this element are those exerted by the rest of the fluid and they must be normal to the surfaces of the element as discussed above. Thus, the fluid exerts pressures Pa, Pb and Pc on this element of area corresponding to the normal forces Fa, Fb and Fc as shown in Figure on the faces BEFC, ADFC and ADEB denoted by Aa, Ab and Ac respectively. Then Fb sin = Fc, Fb cos = Fa (by equilibrium) Ab sin = Ac, Ab cos = Aa (by geometry) 7
• 8. Fb / Ab = Fc / Ac = Fa / Ac ; Pa = Pb = Pc Hence, pressure exerted is same in all directions in a fluid at rest. It again reminds us that like other types of stress, pressure is not a vector quantity. No direction can be assigned to it. The force against any area within (or bounding) a fluid at rest and under pressure is normal to the area, regardless of the orientation of the area. Now consider a fluid element in the form of a horizontal bar of uniform cross- section. The bar is in equilibrium. The horizontal forces exerted at its two ends must be balanced or the pressure at the two ends should be equal. This proves that for a liquid in equilibrium the pressure is same at all points in a horizontal plane. Suppose the pressure were not equal in different parts of the fluid, then there would be a flow as the fluid will have some net force acting on it. Hence in the absence of flow the pressure in the fluid must be same everywhere. Wind is flow of air due to pressure differences. 8
• 9. Applications of Pascal’s Law • Hydraulic Lift • Hydraulic Brake • Hydraulic Jack and Hydraulic Press • Artesian Wells and Dams 9
• 10. Hydraulic Lift A hydraulic lift is a device for moving objects using force created by pressure on a liquid inside a cylinder that moves a piston upward. Incompressible oil is pumped into the cylinder, which forces the piston upward. When a valve opens to release the oil, the piston lowers by gravitational force. The principle for hydraulic lifts is based on Pascal‘s law for generating force or motion, which states that pressure change on an 10
• 11. incompressible liquid in a confined space is passed equally throughout the liquid in all directions. The concept of Pascal‘s law and its application to hydraulics can be seen in below, where a small amount of force is applied to an incompressible liquid on the left to create a large amount of force on the right. In a hydraulic lift as shown in Figure two pistons are separated by the space 11
• 12. filled with a liquid. A piston of small cross section A1 is used to exert a force F1 directly on the liquid. The pressure P= F1 /A1 is transmitted throughout the liquid to the larger cylinder attached with a larger piston of area A2, which results in an upward force of P × A2. Therefore, the piston is capable of supporting a large force (large weight of, say a car or a truck, placed on the platform) F2 = PA2 = F1 A2 /A1 By changing the force at A1, the platform can be moved up or down. Thus, the applied force has been increased by a factor of A2 /A1 and this factor is the mechanical advantage of the device. 12
• 13. Hydraulic Brake A hydraulic brakes system is a braking mechanism that uses brake fluid to transmit force into the system. The fluid transfers pressure from the control mechanism to the braking mechanism. Hydraulic braking systems are widely used in low- speed four-wheelers such as the Tata Ace. It works 13
• 14. with the drum type, while the disc type is used in almost all cars. In this type of braking system, the mechanical forces transmitted by the driver on the brake pedal are converted to hydraulic pressure by a device known as a master cylinder, and then this hydraulic pressure is sent to the final drum or disc. It goes to stop or accelerate the caliper vehicle. 14
• 15. Construction The construction of hydraulic braking systems involves the following part arrangement :- • Brake pedal or lever • Wreath also known as actuating rod • Master cylinder • One or two pistons • A return spring • Gasket or O rings • Brake fluid and Fluid reservoir 15
• 16. Working The following process occurs when the driver applies a brake in a vehicle equipped with hydraulic brakes mounted on the drum. The speed or activation of the brake pedal causes a master cylinder to move a rod connected between the pedal and the piston, which in turn pushes the piston of the master cylinder inside the master cylinder like a medical syringe. This movement of the pistons inside the master cylinders causes compression of the brake fluid inside the master cylinder, which in turn converts mechanical energy to hydraulic pressure. This highly 16
• 17. compressed brake fluid from the master cylinders moves inside the brake, and this hydraulic pressure transfers from the master cylinder to the brake drum. When this high-pressure brake fluid o enters the wheel cylinder or drum cylinder due to its high pressure, there is movement in the cylinder piston, which in turn expands the static brake shoe attached to it. Due to the expansion of the brake shoe, a friction contact is formed between the brake shoes and the drum lining (rotating drum part), which in turn converts the kinetic energy of the vehicle into heat energy & finally braking. 17
• 18. • A change in pressure applied to an enclosed fluid is transmitted undiminished to all portions of the fluid and to the walls of its container. Pascal's principle, an experimentally verified fact, is what makes pressure so important in fluids. • It has many applications in daily life. Several devices, such as hydraulic lift and hydraulic brakes, are based on Pascal's law. Fluids are used for transmitting pressure in all these devices. In a hydraulic lift, as shown in the figure above, two pistons are separated by the space filled with a liquid. 18
• 19. REFERENCES • NCERT book • Britannica • Wikipedia • IQS Directory • Google • Mechanical Jungle • Brainly 19
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