Numerical simulation of non-newtonian flow and heat transfer in tubes of heat exchangers with reciprocating insert devices
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Martínez Hernández, David Sebastián; Solano Fernández, Juan Pedro; Pérez García, José; Viedma Robles, AntonioResearch Group
Mecánica de Fluidos e Ingeniería TérmicaKnowledge Area
Mecánica de FluidosSponsors
This research has been partially financed by the DPI2007- 66551-C02-01 grant of the Spanish Ministery of Science and the company “HRS Spiratube”. The authors are grateful to the Computer Center of SAIT (UPCT) for providing the technical resources for CFD computations.Publication date
2010-08-08Publisher
American Society of Mechanical Engineers (ASME)Bibliographic Citation
MARTÍNEZ HERNÁNDEZ, David Sebastián et al. Numerical simulation of non-newtonian flow and heat transfer in tubes of heat exchangers with reciprocating insert devices. En: International Heat Transfer Conference IHTC-14. Washington D.C., USA, 2010.Keywords
Heat transferHeat exchanger
Numerical simulation
Non-newtonian flow
Insert devices
Abstract
Non-Newtonian flow and heat transfer in tubes of heat exchangers with reciprocating insert devices have been numerically investigated. The heat exchanger is mechanically assisted by a reciprocating cylinder, which moves the scraping
rods inserted in the tubes. An array of semi-circular elements is mounted on each rod, with a pitch p=5D. These elements fit the internal diameter of the tubes. During the reciprocating motion, they scrape the inner tube wall, avoiding fouling. Additionally, the movement of the inserted device generates macroscopic displacements of the flow, which continuously mix core regions with peripheral flow. A power law model with temperature dependent properties
is implemented in FLUENT, for a Carboxymethil cellulose (CMC) solution in water with concentration of 2%. Flow pattern and pressure drop mechanisms are analyzed in static and dynamic conditions, and heat transfer enhancement features are discussed.
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