%0 Journal Article 
%A García Pinar, Alberto
%A Solano Fernández, Juan Pedro
%A Viedma Robles, Antonio
%A Martínez Hernández, David Sebastián
%T Heat transfer enhancement in smooth tube with wire coil insert in laminar and transitional non-newtonian flow
%D 2010
%U http://hdl.handle.net/10317/1555
%X This work presents an experimental study on the heat transfer enhancement by means of a tube with wire-coil insert,for non-Newtonian laminar and transitional flow. The dimensionless pitch and wire diameter (based on the plain tube inner diameter) were chosen as p/D= 1 and e/D=0.09. Two pseudoplastic test fluids have been used: 1% by weight aqueous solutions of carboxymethyl cellulose (CMC) with high viscosity and medium viscosity. A wide range of flow
conditions has been covered: Reynolds number from 10 to 1200 and Prandtl number from 150 to 1900. Isothermal pressure drop tests and heat transfer experiments under uniform heat flux conditions were performed on both the plain tube and the tube with wire-coil. The plain tube results have shown an excellent
agreement with the available data. At Reynolds numbers below Re=400, the wire-coil insert has no effect in heat transfer.
However, it becomes more effective as turbulence is established: at Re=1200, the wire-coil increases the heat
transfer rate by 350%, with a pressure drop increase of 250%. At Reynolds number Re=1800, if a wire-coil is inserted in a
smooth tube the heat transfer rate will be increased by 300% with no increase in pumping power.
%K Mecánica de Fluidos
%K Enhanced heat transfer
%K Non-newtonian flow
%K Wire coil insert
%K Transitional flow
%K Mayor transferencia de calor
%K Flujos no newtonianos
%K Bobinas de alambre
%K Flujos de transición
%~ GOEDOC, SUB GOETTINGEN