# When the hydrofoil shown was tested, the minimum pressure on the surface of the foil was...

###### Question:  When the hydrofoil shown was tested, the minimum pressure on the surface of the foil was found to be 80 kPa absolute when the foil was submerged 1.9 m and towed at a speed of 7 m/s. At the same depth, at what speed will cavitation first occur? Assume irrotational flow for both cases and T = 10 °C. Water = 10°C (50°F) (a) What is the absolute pressure of the atmosphere? kPa (b) What is the specific weight of water at this temperature? N/m3 (c) What is the absolute pressure in the water at the depth of the hydrofoil? kPa (d) What is the vapor pressure of water at this temperature? kPa Click if you would like to Show Work for this question: Open Show Work
Part 2 The approach is to determine the pressure coefficient for the minimum pressure at the given speed, and then use this pressure coefficient to determine the speed at which cavitation occurs. (a) What is the difference in pressure between the minimum pressure and that in the water at the same depth (free stream pressure) at the given conditions? kPa (b) What is the value of the pressure coefficient? Click if you would like to Show Work for this question: Open Show Work By accessing this Question Assistance, you will learn while you earn points based on the Point Potential Policy set by your instructor. Part 3 (a) What is the absolute value of the minimum pressure when cavitation occurs? Pcav = kPa (b) What is the value of the pressure coefficient when cavitation occurs? (c) What is the velocity at which cavitation will occur? V = m/s Click if you would like to Show Work for this question: Open Show Work

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