The Hershel- Buckley fluids are known as Thixotropic fluid, while Bingham fluids are know as Ideal Plastic fluids.
General equation is τ = μ .[
] ^ n + τ0
] ^ n + τ0
1) For Bingham and Thixotropic fluids, τ0 is greater than zero.
2) For all other fluids, τ0 = 0
3) For newtonian fluids, τ0 is zero and value of exponent n is 1.
4) For Pseudoplastic and Thixotropic fluids, n<1.
5) For Dilatant fluids, n> 1.
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