# Emre Cenker Flashcards

What is specific volume?

Inverse of density

What is compressibility of a fluid?

a measure of the relative volume change of a fluid or solid as a response to a pressure (or mean stress) change. Units of m^{2}/N

v is volume

p is pressure

This is isothermal compressibility as it happens at constant temperture.

What is the mach number when flow is incompressiable

m<0.1

What is the ideal gas equation?

pv=Rt

R is the gas constant specific to that gas.

How do you find the specific gas constant of a gas?

8314 J/kmol.K ÷ molecular weight (kg/kmol)

How do you relate C_{p} and C_{v}?

C_{p}=C_{v}+R

C_{p}/C_{v}=υ

What is the ratio of specific heats?

υ=C_{p}/C_{v}

What is the speed of sound in a gas?

c=(υRT)^{0.5}

What is the critcal velocity?

local speed of sound

What is hs?

Stagnation enthalpy. Sum of local enthalpy and local kinematic energy in flow.

At stagation points.

When do critical conditions occour?

When the local mach number M_{i} is 1

What is the critical temperture ratio?

T_{local} is the general temperture

T_{s} is the stagnation temperture (velcity = 0)

What is the critical pressure ratio?

What is the critical density ratio?

Mass flow rate for a chocked nozzle?

Mass low rate for a choked nozzle does not depend on pressure downstream once it falls below the critical pressure. This flow rate can be increased only by increasing the stagnation pressure ps upstream