ME-201 Study Guide - Final Guide: Joule, Control Volume, Enthalpy
Document Summary
4. 41 air modeled as an ideal gas enters a well-insulated diffuser operating at steady state at 270. K with a velocity of 180 m/s and exits with a velocity of 48. 4 m/s. For negligible potential energy effects, determine the exit temperature, in k. Engineering model: the control volume shown with the schematic is at steady state, no stray heat transfer occurs between the air and its surroundings, model the air as an ideal gas, for the control volume, pe = 0. 2 v2: + g(z1 z2)] simplifies to. 0 = (h1 h2) + (v1. For an ideal gas, specific enthalpy is a function of only temperature. Solving for the exit specific enthalpy h2 = h1 + (v1. From table a-22 at t1 = 270 k, h2 = 270. 11 kj/kg. Substituting values and solving for exit specific enthalpy. From table a-22 at h2 = 285. 14 kj/kg, the corresponding temperature is t2 = 285 k.
