English

Distinguish between streamlined flow and turbulent flow.

Advertisements
Advertisements

Question

Distinguish between streamlined flow and turbulent flow.

Distinguish Between
Advertisements

Solution

  Streamlined flow Turbulent Flow
1. When a liquid flows such that each particle of the liquid passing a point moves along the same path and has the same velocity as its predecessor then flow is said to be streamlined flow. When the speed of the moving liquid exceeds the critical speed vc, the motion becomes turbulent.
2. In a streamline flow, the velocity of a fluid at a given point is always constant. In a turbulent flow, the velocity of a fluid at any point does not remain constant.
3. The path taken by the particle in this flow is a curve. The path taken by the particle in this flow becomes erratic and whirlpool. Like circles.
4. Streamlines do not change and never intersect. Streamlines and flow tubes change continuously.
shaalaa.com
  Is there an error in this question or solution?
Chapter 7: Properties of Matter - Evaluation [Page 92]

APPEARS IN

Samacheer Kalvi Physics - Volume 1 and 2 [English] Class 11 TN Board
Chapter 7 Properties of Matter
Evaluation | Q II. 14. | Page 92

RELATED QUESTIONS

Fill in the blanks using the word(s) from the list appended with each statement

Viscosity of gases. .. with temperature, whereas viscosity of liquids . . . with temperature (increases / decreases)


(a) What is the largest average velocity of blood flow in an artery of radius 2 × 10–3 m if the flow must remain laminar? (b) What is the corresponding flow rate? (Take viscosity of blood to be 2.084 × 10–3 Pa s).


The viscous force acting between two layers of a liquid is given by \[\frac{F}{A} = - \eta\frac{dv}{dz}\]. This F/A may be called 


A raindrop falls near the surface of the earth with almost uniform velocity because


A spherical ball is dropped in a long column of a viscous liquid. The speed of the ball as a function of time may be best represented by the graph 


A metal sphere of radius 1 mm and mass 50 mg falls vertically in glycerine. Find (a) the viscous force exerted by the glycerine on the sphere when the speed of the sphere is 1 cm s−1, (b) the hydrostatic force exerted by the glycerine on the sphere and (c) the terminal velocity with which the sphere will move down without acceleration. Density of glycerine = 1260 kg m−3 and its coefficient of viscosity at room temperature = 8.0 poise. 


Estimate the speed of vertically falling raindrops from the following data. Radius of the drops = 0.02 cm, viscosity of air = 1.8 × 10−4 poise, g= 9.9 × 10 ms−2 and density of water = 1000 kg m−3.


The unit of viscosity is


Which has greater viscosity, oil or honey? Why?


A small sphere of radius 2 cm falls from rest in a viscous liquid. Heat is produced due to viscous force. The rate of production of heat when the sphere attains its terminal velocity is proportional to


With an increase in temperature, the viscosity of liquid and gas, respectively will __________.


What is Reynold’s number? Give its significance.


Define terminal velocity.


Two streamlines cannot cross each other. Why?


Why two holes are made to empty an oil tin?


From amongst the following curves, which one shows the variation of the velocity v with time t for a small-sized spherical body falling vertically in a long column of a viscous liquid.


The tangential force or viscous drag on any layer of the liquid is directly proportional to the velocity gradient `"dv"/"dx"`. Then the direction of dx velocity gradient is ____________.


In motors, more viscous oil is used in summer than in winter due to ____________.


Analogy

Viscous force: ______:: Buoyant force: ______.


Clouds float in the air due to ______.


The velocity of a small ball of mass M and density d, when dropped in a container filled with glycerine becomes constant after some time. If the density of glycerine is `"d"/2`, then the viscous force acting on the ball will be ______


The velocity of a small ball of mass M and density d, when dropped in a container filled with glycerine becomes constant after some time. If the density of glycerine is `"d"/2` , then the viscous force acting on the ball will be ______.


With increase in temperature, the viscosity of ______.

  1. gases decreases.
  2. liquids increases.
  3. gases increases.
  4. liquids decreases.

The coefficient of apparent expansion of mercury in a glass vessel is 153 × 10-6/°C and in a steel vessel is 144 × 10-6/°C. If α for steel is 12 × 10-6/°C, then that of glass is ______.


A liquid of density ρ and coefficient of viscosity η flows with velocity v through a tube of diameter D. A quantity `"R" = (rho"vD")/η`, determines whether the flow will be streamlined or turbulent. R has the dimension of ______.


Define the coefficient of viscosity.


Define velocity gradient.


State and explain Newton's law of viscosity.


A water pipe with diameter of 5.0 cm is connected to another pipe of diameter 2.5 cm. How would the speeds of the water flow compare?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×