Flow field and heat transfer investigation in tubes of heat exchangers with motionless scrapers
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Solano Fernández, Juan Pedro; García Pinar, Alberto; Vicente Quiles, Pedro Ginés; Viedma Robles, AntonioResearch Group
Mecánica de Fluidos e Ingeniería TérmicaKnowledge Area
Mecánica de FluidosPublication date
2011-08Publisher
ElsevierBibliographic Citation
Applied Thermal Engineering. Volume 31, Issue 11-125, August 2011, Pages 2013-2024.Peer review
SIKeywords
Heat transferHeat exchanger
Scraped surface
Flow field
Abstract
Flow pattern and thermal-hydraulic characteristics in an innovative tube insert have been experimentally and numerically investigated. The insert device is a concept
envisioned for reciprocating scraped surface heat exchangers. It consists of a concentric
rod, that mounts an array of semicircular plugs fitted to the inner tube wall.
In motionless conditions, the insert works as a turbulence promoter, enhancing heat
transfer in laminar regime. Fundamental flow features in the symmetry plane of the
tube have been assessed with Particle Image Velocimetry technique. A general model
of the flow mechanism has been defined, identifying three regions along a geometrical
pitch: recirculation bubbles, flow acceleration and transverse vortex. Results have been complemented with experimental data on pressure drop and heat transfer. The
transition onset is clearly identified, and the mechanisms that promote turbulence at
low Reynolds number are investigated and discussed. CFD simulations for ...
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