Question

Support answer with drawing that indicates the cases

+ with example realted to medical field if possible

- draw the cases

- give similar examples

30. Is it possible for a fluid in a tube to flow in the direction from low pressure to high pressure? If so, give an example. If not, why not?

Answer 1

From Bernoulis from Bernoulli's equation rho + K.E. + Potential energy = constant rho = Pressure energy therefore Total energy = Pressure energy + kinetic energy + Potential energy Fluid always flows from higher energy to lower energy region but not necessarily from high pressure to low pressure. Consider the pipe like one shown in figure so from equation of continuity A_1 V_1 = A_2 V_2 therefore V_B > V_A so (K.E.)_B > (K.E.)_A therefore (pressure)_B < (pressure)_A from Bernoulli's eq therefore fluid is flowing from high pressure to low pressure But V_B > V_C implies (K.E.)_C < (K.E.)_B therefore (pressure)_B < (pressure)_C from Bernoulli's eq But still fluid is flowing from B to C i.e from low pressure to high pressure. So for static fluid, flow is always from high to low pressure but opposite can happen for dynamic cases. i.e when fluid is moving fast \r\n Example 1) Capillary tube, Here fluid raises \r\n