Engineering Design Guides (The Selection and use of Cast
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Additional resources for Engineering Design Guides (The Selection and use of Cast Irons) 31
Example text
At the point of impending motion, U1 + T1 = U2 + T2 F = µs N If friction is present, then the work done by the friction forces must be accounted for. When motion is present F = µk N, where U1 + T1 + W1→2 = U2 + T2 µk = (Care must be exercised during computations to correctly compute the algebraic sign of the work term). the coefficient of kinetic friction. The value of µk is often taken to be 75% of µs. Belt friction is discussed in the Statics section. Impact Momentum is conserved while energy may or may not be conserved.
For heat capacities that are temperature dependent, the value to be used in the above equations for ∆h is know as the mean heat capacity ( c p ) and is given by P Heat Capacity at Constant Volume, æ ∂u ö cv = ç ÷ è ∂T ø v T cp = Quality x (applies to liquid-vapor systems at saturation) is defined as the mass fraction of the vapor phase: òT12 c p dT T2 − T1 Also, for constant entropy processes: x = mg/(mg + mf), where P1v1k = P2v2k; mg = mass of vapor and mf = mass of liquid. T1P1 (1–k)/k = T2P2 (1–k)/k T1v1 (k–1) = T2v2 (k–1), where k = cp/cv FIRST LAW OF THERMODYNAMICS The First Law of Thermodynamics is a statement of conservation of energy in a thermodynamic system.
Manual of Engineering Practice, No. , 1942. See footnote 2. H. G. Keyes, Thermodynamic Properties of Steam, John Wiley & Sons, 1936. , 1970. 781 × 10–3 Pa's, and so on. K. and Robert L. Street, Elementary Fluid Mechanics, Copyright 1954, John Wiley & Sons, Inc. K. Vennard. Diagrams reprinted by permission of John Wiley & Sons, Inc 44 FLUID MECHANICS (continued) MOODY (STANTON) DIAGRAM Reprinted by permission of ASHRAE. 0015 FLUID MECHANICS (continued) DRAG COEFFICIENTS FOR SPHERES, DISKS, AND CYLINDERS ρV2A 24 , Re < 10 Re CD 2FD CD = 46 DV THERMODYNAMICS R is specific to each gas but can be found from PROPERTIES OF SINGLE-COMPONENT SYSTEMS R= Nomenclature 1.