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i want to know at the critical velocity why the flow starts curving what r the torques acting for this .rotational flow is due to complementary shears due to viscosity.how is iertial forces is a force here how to visualise in action them along with viscous.

in a flow through expansion of pipe suddenly , why does fluid expand whole pipe,at steady flow it fills whole pipe and velocity decreases. why cant fluid flow straight without filling entire cross section as it did before keeping the air above or below which is at the same pressure and exit...

in a flow through pipe from a tank , initially valve is closed which is at the inlet to pipe and full of air from valve on wards to exit point which is pipe other end open to air, how the steady state occurs in this case. as there is pressure head of tank at the start it accelerates through...

why does surface tension decreases with temperature. dowe have mechanistic explanation for it.

can any one explain how to analyse about flow around vibrating(harmonic) cylinder in fluid at rest,physically how it forms secondary steady flow

can any one explain how to analyse about flow around vibrating cylinder in fluid at rest,physically how it forms secondary steady flow

when a elastic material like rubber stretched work done in stretching against restoring forces is stored as potential energy,same as a spring. a rubber can do work if we attach a load to it while regaining original length. where as in ideal gas which also resists compression and that...