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What Is Viscosity Of A Liquid?
Viscosity: When the motion of a liquid over a fixed horizontal surface is slow and steady, i.e, when the motion of a liquid over a fixed horizontal surface is streamline, its contact with the fixed surface is stationary and the velocity of each layer increases with its distance from the fixed surface. If any two…
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Define Coefficient Of Viscosity Of A liquid, Its Dimension And Units.
Coefficient of viscosity: Let us consider a region of a liquid flowing in streamline motion parallel to the X-Y plane along the positive Y direction. Let us consider two adjacent layers at a distance z and z+dz from the fixed layer above the X-Y plane. The velocities of these two adjacent layers are u and…
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Define The Units Of Coefficient Of Viscosity In C.G.S. And S.I. Units.
Poise: If a tangential force of one dyne is required per sq. cm. to maintain a relative velocity of 1 cm/sec between two layers 1 cm. apart, then the coefficient of viscosity is 1 poise. Decapoise: If a tangential force of 1 Newton is required per sq. m. to maintain a relative velocity of 1…
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What Are Newtonian And Non-Newtonian Liquids?
Newtonian & Non-Newtonian liquids: The coefficient of viscosity of a liquid is given by , or, . where, is the dragging force acting in contact area of two adjacent layers, is the velocity gradient along the perpendicular direction of the liquid flow. The above equation is known as Newton’s law of streamline motion of the…
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What Do You Mean By Streamline And Turbulent Motion Of A Liquid?
Laminar or Streamline motion: If a liquid flows in such a way that its velocity at any point in the liquid is always the same in direction as well as in magnitude, then the flow of the liquid is said to be steady or streamline flow. The path followed by the particles of the liquid…
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What is Critical Velocity?
Critical Velocity: Critical velocity of a fluid is the maximum velocity of flow above which the flow ceases to be streamlined and becomes turbulent.
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What Is Reynold’s Number? Explain The Significance Of Reynold’s Number.
Reynold’s Number: Experimentally, it is found that the critical velocity of a liquid depends upon its coefficient of viscosity , density of the liquid , and the diameter of the cylindrical tube into which the liquid flows. Therefore, where, is the dimension less constant called Reynold’s number, a,b,c are dimensionless number to which , and…
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Distinguish Between Streamline And Turbulent Motion With Special Reference Of Reynold’s Number.
Distinguish between streamline and turbulent motion: If a liquid flows in such a way that its velocity at any point is always the same in magnitude as well as in the direction, then the flow of the liquid is said to be steady or streamline flow. On the other hand, if a liquid flows in…
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Derive Poiseuille’s Formula For The Flow Of A Liquid Through Narrow Horizontal Tube.
Poiseuille’s Formula: Let us consider, a streamline motion of a liquid through a narrow tube, The streamlines are parallel to the axis of the tube and there is no radial flow of the liquid in the tube. The pressure over any given cross-section normal to the axis of the tube is constant. The pressure varies…
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Explain Two Important Corrections To Poiseuille’s Formula.
Corrections To Poiseuille’s Equation: Let us consider a horizontal tube of radius R and length l, If P is the pressure difference between the two ends of the tube then the total volume that passes through the tube in unit time is given by, [Read in detail] Where is the coefficient of viscosity of the…
