What is the applicability of Newton Sine-Squared Law?

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Filippo Maria Denaro

At the best of my knowledge, it is applicable (in a first approximation) for rarefied flows such as for re-enter vehicles. Have a look here https://books.google.it/books?id=GzVIBAAAQBAJ&pg=PA40&lpg=PA40&dq=Newton+Sine-Squared+Law&source=bl&ots=OS4I2l9HHp&sig=tB1HeZSZo1eZ3Gc1mUigCT89Ygc&hl=it&sa=X&ved=0ahUKEwixkNTdnLLWAhUrK8AKHdJeDpYQ6AEILzAB#v=onepage&q=Newton%20Sine-Squared%20Law&f=false

Ingo Riess

Although originally developed for low Reynolds flow, Newton's sine squared law is applied for hypersonic flow. At low Reynolds numbers, aerodynamic resistance is driven by viscous friction, at high Reynolds numbers is is determined by pressure drag. Newton's law is based on pressure drag. So I'd say... no, it is not applicable to your Re=1000 case.

http://nptel.ac.in/courses/101103003/9

Samuel Luis

Mostly applicable for rarefied flows(hypersonic) like flow around re-entry vehicles.

Refer

https://books.google.co.in/books/about/Modern_Compressible_Flow_With_Historical.html?id=woeqa4-a5EgC&redir_esc=y pg 559 - 565

Nadaraja Pillai

For initial approximation to calculate the coefficient of pressure we can use Newton's sine squared law, however, it is limited to the case where the flow is over a flat inclined plate.