Keegy United States - eTechTour: Mach number

Mach number

Its defined as the speed of an object moving through air or any fluid substance, divided by the speed of sound as it is in that substance. It is commonly used to represent an object’s (such as an aircraft or missile) speed, when it is traveling at (or at multiples of) the speed of sound....

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eTechTour — May 01

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Prandtl number

It’s a dimensionless number approximating the ratio of momentum diffusivity (kinematics viscosity) and thermal diffusivity. It is named after the German physicist Ludwig Prandtl. It is defined as: Whereas the Re and Gr number are subscripted with a length scale variable, Prandtl numb...

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eTechTour — May 01

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Rayleigh number

Its a is a dimensionless number associated with buoyancy driven flow that is free convection or natural convection. When the Rayleigh number is below the critical value for a fluid, heat transfer is primarily in the form of conduction; when it exceeds the critical value, heat transfer is prim...

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eTechTour — April 26

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Nusselt number:

Nusselt number is the ratio of convective heat transfer to conductive heat transfer across (normal to) the boundary. Named after, Wilhelm Nusselt, it is a dimensionless number. The conductive component is measured under the same conditions as the heat convection but with a (hypothetically) sta...

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eTechTour — April 24

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Sequential Inputs of numbers Without 8

Sequential Inputs of numbers Without 8 Without 8 12345679 x 9 = 111111111 12345679 x 18 = 222222222 12345679 x 27 = 333333333 12345679 x 36 = 444444444 12345679 x 45 = 555555555 12345679 x 54 = 666666666 12345679 x 63 = 777777777 12345679 x 72 = 888888888 ...

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eTechTour — April 13

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Sequential 8’s with 9

Sequential 8’s with 9 Sequential 8’s with 9 9 x 9 + 7 = 88 98 x 9 + 6 = 888 987 x 9 + 5 = 8888 9876 x 9 + 4 = 88888 98765 x 9 + 3 = 888888 987654 x 9 + 2 = 8888888 9876543 x 9 + 1 = 88888888 98765432 x 9 + 0 = 888888888 ...

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eTechTour — April 13