engineering recuitment AAI JE Technical Mock Test 2020-21 Fluid Mechanics Fluid Kinematics Continuity Equation
Consider the two-dimensional velocity field given by \(\vec V = \left( {5 + {a_1}x + {b_1}y} \right)\hat i + \left( {4{a_2}x + {b_2}y} \right)\hat j,\) where a1, b1, a2 and b2 Are constants. Which one of the following conditions needs to be satisfied for the flow to be incompressible?
1
a1 + b1 = 0
2
a1 + b2 = 0
3
a2 + b2 = 0
4
a2 + b1 = 0