Heat and Flow Technology I.

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Presentation transcript:

Heat and Flow Technology I. ÓBUDA UNIVERSITY Heat and Flow Technology I. Use only inside Dr. Ferenc Szlivka Professor Dr. Szlivka: Heat and Flow Technology I_1

Properties of Fluids and Gases 1. Chapter Dr. Szlivka: Fluid Mechanics 1. chapter

Phases diagram tcrit OC pcrit bar vcrit m3/kg r kg/m3 Water 374 225 3.1 10-3 322 oxygen -119 51 2.33 10-3 429 nitrogen -147 34.6 3.20 10-3 312 air -141 38 2.98 10-3 335 Carbon dioxide 31.1 73 2.15 10-3 464

Three fases system p-v-T

Saturation-vapor pressure

Cavitation erosion on a ship screw Fig. 1.3

Ideal gas state equation isotropic (exponent) power cp Isobaric heat capacity cv Isochoric heat capacity

Air

Ideal gas simple state exchanging p-v and T-s on diagram

Isotherm state exchange

Isochor (isovolume) state exchange

Isobar state exchange

Adiabatic state exchange

Politropic state exchange

Compressibility of liquids 1.2 tab. Liquid Young (elastic) modulus"E" Mpa Etil alcohol 896 Petrol 1 062 Diesel oil 1 303 Water 2 179 Glycerin 4 509 Mercury 24 750 Steel 200 000 Áaésé