A Review of Nusslet Number under Laminar Flow Condition in Heat Exchanger

Abstract

We present the results of measured heat transfer coefficients for different sodium car boxy methyl cellulose concentrations at two different lengths of coil L=2.82m, L=2.362m and with two different heat inputs 1.0kW and 1.5kW. Test solutions of sodium car boxy methyl cellulose concentrations of 0.05%, 0.1%, 0.15% and 0.2% were used in our experimental runs. The rheological properties like flow behavior index, consistency index and viscosity data were measured experimentally using Rotating Cylinder Method for the test solutions used. Correlations are presented for Newtonian and non Newtonian fluids in laminar flow conditions. Individual heat transfer coefficients of the helical coil has been evaluated using modified Wilson Plot at different flow rates. A helical coil with diameter D=156mm, constant pitch=6mm and having three turns was used in our study. A four flat blade paddle impeller was used to verify the mixed fluid, under unsteady heating of Newtonian and non-Newtonian fluids in an flat bottom agitated vessel without baffles. The curvature ratio δ= 0.04102 is maintained constant. A Kanthal Heating Element Equipment have been design and fabricated to optimize the heating of the fluids in an agitated vessel.