For an irrotational flow, the equation \(\frac{{{\partial ^2}\phi }}{{\partial {x^2}}} + \frac{{{\partial ^2}\phi }}{{\partial {y^2}}}\) is known as
1
Bernoulli’s equation
2
Cauchy Riemann’s equation
3
Eular’s equation
4
Laplace equation
For an irrotational flow, the equation \(\frac{{{\partial ^2}\phi }}{{\partial {x^2}}} + \frac{{{\partial ^2}\phi }}{{\partial {y^2}}}\) is known as