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Heat transfer enhancement of laminar and transitional Newtonian and non-Newtonian flows in tubes with wire coil inserts.

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Identifiers
URI: http://hdl.handle.net/10317/5516
ISSN: 0017-9310
DOI: 10.1016/j.ijheatmasstransfer.2014.04.060
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Author
Martínez Hernández, David Sebastián; García Pinar, Alberto; Solano Fernández, Juan Pedro; Viedma Robles, Antonio
Research Group
Mecánica de Fluidos e Ingeniería Térmica
Knowledge Area
Máquinas y Motores Térmicos; Mecánica de Fluidos
Publication date
2014-09
Bibliographic Citation
D.S. Martinez, A. García, J. P. Solano , A. Viedma. “Heat transfer enhancement of laminar and transitional Newtonian and non-Newtonian flows in tubes with wire coil inserts” Int. J. of Heat and Mass Transfer, Vol.76, September 2014, Pages 540–548.
Peer review
SI
Keywords
Heat transfer enhancement
Wire coil inserts
Non Newtonian flow
Transitional flow
Abstract
This work presents an experimental study on two different wire coils inserted in a smooth tube using both Newtonian and non-Newtonian fluids to characterize their thermohydraulic behavior in laminar and transitional flow. Dimensionless pitches of the wire coils were chosen as p=D = 1 and 2, whereas dimensionless wire diameter was e=D = 0.09 for both wire coils. Non-Newtonian tests considered different viscosity types with concentration of 1% of CMC (carboxyl-methyl-cellulose) solution in water at several temperatures; a wide range of flow conditions has been covered: Reynolds number from 10 to 1300 and Prandtl number from 150 to 1900. Newtonian test were carried out with propylene glycol as working fluid, covering a similar range of Reynolds number as the previously indicated for non-Newtonian fluids. Isothermal pressure drop tests and heat transfer experiments under uniform heat flux conditions were performed, and results were contrasted with own experimental data for the smooth tube ...
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