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12 CHAPTER 2 - 1948 Guide symbols found necessary in the individual chapters will be found in a list at the end of Chapters 3, 4, 5, .7, 15, 16, 39, and 41. Acceleration, due to gravity...... ................................... .......................... .... ................. g Acceleration, linear___________________________________________________ ...........--o Area.,-__________________________ __________ :..... ........................ -A Change in.specific volume during vaporization--.'..... ...........J...... .'........... ......... ........ -'_rfg Density, Weight per unit volume. Specific weight..--_________________ __ --d or p (rho) r Distance, linear.___________ ___ .____________________________________ _______s Dry saturated vapor, Dry saturated gas at saturation pressure and temperature, vapor in contact with liquid______________________________ ______ --Subscript g Efficiency.................................. ............. .............................................................................. t) Elevation above some datum ^ ____________________ ______ _____ --............. --s, Z Einissivity --- ............................................................................................................ ....;..e Energy in general; work, total; work, molal J '! ............................ --:------ E Entropy. (The capital should be used for any weight, and the small letter for unit weight)_______________________________________;.............. ..... ~.................... or s Force, total load.._________________________ _______ ____ ____ ______________ ____ F Gas Constant, in equation pV = nRT............................ .... ... ......... ........... ...............--R Head____ ,:__-____ _:_____________________________-.'....H or h Heat content, Total heat, Enthalpy. (The capital should be used for any weight and the small letter for unit weight)____________ ______ ;--.----------------- ----H or h Heat content of saturated liquid, Total heat of saturated liquid, Enthalpy of saturated liquid, Sometimes called heat of the liquid-..-.:.._______________hi Heat content of dry saturated vapor. Total heat of dry saturated vapor, Enthalpy of dry saturated vapor --:------------------------------------------------------------------------- ftg Heat of vaporization at constant pressure___ _____ 1..... U.,,.......... ......... .. .......... L or ifg Hydraulic radius __________________________________________ _Rn Internal energy, Intrinsic energy. (The capital should be used for any weight and the small letter for unit weight) -- ----------------- .................. V or u Length of path of heat flow, thickness............... .... .................................. ........ ...... ------ L Load, total ________________ .................... ................ ..............---.----;..--W Mechanical efficiency-______________ ......... --.......... ....... ..... ...................... :----- --em Mechanical equivalent of heat..____________------------------------------------------- J Power, Horsepower, Work per unit time_____________________________ ___________ PPressure, Absolute pressure, Gage pressure. Force per unit area------------------------------ p Quantity (total) of fluid, water, gas, heat; Quantity by volume; Total quantity of heat transferred____________ ________________________________________ ...--Q Quality of steam, Pounds of dry steam per pound of mixturex Reynolds NumberJ:---------------------------------------------------------------------------- Nut Saturated liquid at saturation pressure and temperature. Liquid in contact with vapor._______________________________ __Subscript f Specific heat.,------------------------------------------------------------- ----------- :............................... c ' Specific heat at constant pressure............ ..................----------- ----------- -------- ;........ --Cp Specific heat at constant volume_______ i----------------------- ----------------------..................-Cv Specific volume, Volume per unit weight. Volume per unit mass_______________ ____.n Temperature (ordinary) F or C. (Theta is used preferably only when t is used for Time in the same discussion)tor 8 {theta) Temperature (absolute) F abs .or K. (Capital theta is used preferably only when small theta is used for ordinary temperature)---------------~.-r--T or 9 {capital theta) Abbreviations and Symbols Thermal conductance *: heat transferred .per (unit time) (degree)____ r _L R kA q L t, - t. Thermal conductance per unit area, Unit conductance: heat transferred per (unit time) (unit area) (degree)--.:s_______________________________ C* = 1 RA A{ti -<,) k L Thermal conductivity: heat transferred per (unit time) (unit area) (degree per unit length).____________________________________________________ g 13 fa -<>- L Surface coefficient of heat transfer, Film coefficient of heat transfer, Individual coefficient of heat transfer: heat transferred per (unit time) (unit area) (degree);-----------;_______ J.__________________________________________ J A ti - t. (In general/ is not equal to k/L, where L is the actual thickness of the fluid film.) Over-all coefficient of heat transfer, Thermal transmittance per unit area: heat transferred per (unit time) (unit area) (degree over-all)..r.V. /,V A h- Thermal transmission (heat transferred per unit time) 9 Thermal resistance (degree per unit of heat transferred per unit time) Jt kA Thermal resistivity:1/k Vaporization values at constant pressure. Differences between values for saturated vapor and saturated liquid at the same pressureSubscript fg Velocity________________ J----------------------------------------------------------------------------- :_-V Viscosity, absolute.;_________________________________________ ___ ______ p Viscosity, kinematic --:------------------------------------------------------------------------------ 1--p/p Volume (total);__________ _________________________ ----------------------------------------- V Volume per unit time. Rate at which quantity of material passes through a machine. Quantity of heat per unit time, Quantity of heat per unit weight--------- q Weight of a major item, Total weight. Weight rate. Weight per unit of power, Weight per unit of time. Work (total) . `Terms ending ivify designate properties independent of size or shape, sometimes called specific propertres. Examples: conductivity, resistivity. Terms ending ana designate quantities dependingnot only on the material, but also upon sire and shape; sometimes called total Quantities, Examples: conductance, transmittance. Terms ending ion designate rate of heat transfer, Examples: conduction, transmission. \