Symbols used in fluid mechanics

a = Acceleration (m/s2 A = Area (m2) ) a = Speed of sound (m/s) F = Force (N) g = acceleration due to gravity (m/s2 ) h = fluid head (m) K = Bulk modulus (MPa ) m = mass (kg) M = mach number u /a M = Molecular weight p = fluid pressure (N /m2 ) pabs - absolute pressure (N /m2 ) pgauge - gauge pressure (N /m2 ) patm - atmospheric pressure (N /m2 ) p s= surface pressure (N /m2 ) Q = Volume flow rate (m3 /s) q = Heat transfer /unit mass (J/kg)

R = Gas Constant (J/(kg.K) Ro = Universal Gas Constant (J/(kg.mol.K) ρ = fluid density (kg /m2 ) s = specific volume (m3 /kg) u = fluid velocity (m/s) v = fluid velocity (m/s) x = depth of centroid (m) β = Compressibility (1/MPa) θ =slope (radians) ρ = density (kg/m3) ρ r = density (kg/m3) τ = shear stress (N /m2) μ = viscosity (Pa.s) ν kinematic viscosity (m2�s-1) υ = Specific volume (m3 / kg) γ= Ratio of Specific Heats

Read More

Quantities Symbols and Dimensions

Quantity	Symbol	Dimensions		Quantity	Symbol	Dimensions
Mass	m	M		Mass /Unit Area	m/A 2	ML -2
Length	l	L		Mass moment	ml	ML
Time	t	T		Moment of Inertia	I	ML 2
Temperature	T	θ		-	-	-
Velocity	u	LT -1		Pressure /Stress	p /σ	ML -1T -2
Acceleration	a	LT -2		Strain	τ	M 0L 0T 0
Momentum/Impulse	mv	MLT -1		Elastic Modulus	E	ML -1T -2
Force	F	MLT -2		Flexural Rigidity	EI	ML 3T -2
Energy - Work	W	ML 2T -2		Shear Modulus	G	ML -1T -2
Power	P	ML 2T -3		Torsional rigidity	GJ	ML 3T -2
Moment of Force	M	ML 2T -2		Stiffness	k	MT -2
Angular momentum	-	ML 2T -1		Angular stiffness	T/η	ML 2T -2
Angle	η	M 0L 0T 0		Flexibiity	1/k	M -1T 2
Angular Velocity	ω	T -1		Vorticity	-	T -1
Angular acceleration	α	T -2		Circulation	-	L 2T -1
Area	A	L 2		Viscosity	μ	ML -1T -1
Volume	V	L 3		Kinematic Viscosity	τ	L 2T -1
First Moment of Area	Ar	L 3		Diffusivity	-	L 2T -1
Second Moment of Area	I	L 4		Friction coefficient	f /μ	M 0L 0T 0
Density	ρ	ML -3		Restitution coefficient		M 0L 0T 0
Specific heat- Constant Pressure	C p	L 2 T -2 θ -1		Specific heat- Constant volume	C v	L 2 T -2 θ -1

Note: a is identified as the local sonic velocity, with dimensions L .T ^-1

Read More

Disclaimer

All the pictures, videos  contained on http://a2zcivilengineering.blogspot.in/ were collected from different public sources, including different websites, considered to be in public domain.

http://a2zcivilengineering.blogspot.in/ does not claim to own exclusive rights on all images and videos published. All sources we use to create our articles are and will be credited with a proper linkback. However, we are hosting a lot of uncredited material from unknown authors we received via mails, from friends and our readers. If you own copyrights to some material such as images or data and you want us to remove it from our pages, contact us to claim your ownership and we will either credit you and your website, or if you wish – completely remove the content.

Read More