What should be the average velocity of water in a tube of radius 2.5 mm so that the flow is just turbulent? Viscosity of water is 0.001 Pa s.
Hint : For flow to be just turbulent `R_(e)` = 2000

What should be the maximum average velocity of water in a tube of diameter 2 em so that the flow is laminar ? Viscosity of water is 10^(-3) Ns m^(-2) ? For laminar flow R-1000.

(a) What is the largest average velocity of blood flow in an artery of radius 2xx10^(-3)m if the flow must remian laminar? (b) What is the corresponding flow rate? Take viscosity of blood to be 2.084xx10^(-3)Pa-s . Density of blood is 1.06xx10^(3)kg//m^(3) .

What should be the radius of a water drop so that the excess pressure inside it is 0.2 atm? Surface tension of water is 72 xx 10^(-3) N//m ?

The flow rate from a tap of diameter 1.25 cm is 3 L//min. The coefficient of viscosity of water is 10^(-3) pa-s. Characterize the flow.

Water is flowing through a tube of radius r with a speed v. If this tube is joined to another tube of radius r/2, what is the speed of water in the second tube?

Water flows at a speed 5 cm s^(-1) through a pipe of radius 2 cm. The visosity of water is 0.001 PI. The Reynolds number and the nature of flow are respectively

When a liquid flows in a tube, there is relative motion between adjacent layers of the liquid. This force is called the viscous force which tends to oppose the relative motion between the layers of the liquid. Newton was the first person to study the factors that govern the viscous force in a liquid. According to Newton’s law of viscous flow, the magnitude of the viscous force on a certain layer of a liquid is given by F = - eta A (dv)/(dx) where A is the area of the layer (dv)/(dx) is the velocity gradient at the layer and eta is the coefficient of viscosity of the liquid. A river is 5 m deep. The velocity of water on its surface is 2 ms^(-1) If the coefficient of viscosity of water is 10 ^(-3 ) Nsm ^(-2) , the viscous force per unit area is :

The flow rate of water from a tap of diameter 1.25 cm is 0.48 L/min. If the coefficient of viscoity of water is 10^(-3) Pa s, what is the nature of flow of water ? Hint : Velocity = ("Flow rate")/("Cross sectional area")

The depression of mercury in a capillary tube of radius R_(1) is observed to be equal to the rise of water in another capillary tube of radius R_(2) . If the ratio of surface tension of mercury and water is 7.5 , ratio of their density (p_(Hg))/(p_("water"))=13.6 and their angle of contact are theta_(Hg)=135^(@) and theta_("water")=0^(@) in the respective tubes then R_(1)//R_(2) is :

Water flows at a speed of 6 cms^-1 through a tube of radius 1 cm. coefficient of viscosity of water at room temperature is 0.01 poise. Calculate the Reynolds number. Is it a steady flow.