In a refrigeration system, brine (10 percent NaCl) by weight having a viscosity of 0.0016 (Ns)/m2 and
Question:
In a refrigeration system, brine (10 percent NaCl) by weight having a viscosity of 0.0016 (Ns)/m2 and a thermal conductivity of 0.85 W/(m K) is flowing through a long 2.5-cm-ID pipe at 6.1 m/s. Under these conditions, the heat transfer coefficient was found to be 16,500 W/(m2 K). For a brine temperature of ??1?C and a pipe temperature of 18.3?C, determine the temperature rise of the brine per meter length of pipe if the velocity of the brine is doubled. Assume that the specific heat of the brine is 3768 J/(kg K) and that its density is equal to that of water.GIVENBrine flowing through a pipeBrine propertiesViscosity (μ) = 0.0016 Ns/m2Thermal conductivity (k) = 0.85 W/(m K)10% NaCl by weightSpecific heat (c) = 3768 J/(kg K)Pipe inside diameter (D) = 2.5 cm = 0.025 mBrine velocity (V) = 6.1 m/sHeat transfer coefficient ( hc ) = 16,500 W/(m2 K)Brine temperature (Tb) = ??1?CPipe temperature (Ts) = 18.3?CASSUMPTIONSSteady stateFully developed flowConstant and uniform pipe wall temperatureDensity of the brine is the same as waterdensity
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Principles of heat transfer
ISBN: 978-0495667704
7th Edition
Authors: Frank Kreith, Raj M. Manglik, Mark S. Bohn