Enhanced Heat Transfer and Fouling Propensity of Diamond-Like Carbon Coated Smooth and Finned Tubes During External Nucleate Boiling

Author:

Reza Malayeri M.12,Evangelidou M.3

Affiliation:

1. School of Chemical and Petroleum Engineering, Shiraz University, Shiraz, Iran;

2. Institute of Process and Environment Engineering, Technische Universität Dresden, Dresden 01069, Germany e-mails: ;

3. Institute of Thermodynamics and Thermal Engineering (ITW), University of Stuttgart, Pfaffenwaldring 6, Stuttgart D-70550, Germany

Abstract

Smooth DLC (diamond-like carbon) coated surfaces can profoundly mitigate scaling during pool boiling of calcium sulphate solutions. Previous investigations though carried out mostly for the smooth surfaces rather than structured, i.e., finned tubes. This study compares experimental results of DLC coated smooth and finned tubes at clean and fouling conditions. Fouling runs were conducted during pool boiling of saturated CaSO4 solution of 1.6 g/L at 300 kW/m2. The substrate of the attempted tubes was stainless steel and finned tubes of 19 and 40 fins per inch were used. The DLC coated smooth tube showed an enhanced clean heat transfer up to 50% and reduced fouling resistance compared to the uncoated smooth tube. After a short operating time, though, the coated smooth tube reached an asymptotic fouling resistance of 0.00005 m2 K/W whereas for the uncoated smooth tube, it was 4.8 times higher. DLC coating of the finned tubes with the physical vapor deposition (PVD) technique implicated difficulties. The base surface of the finned tubes was defectively coated. The defectiveness of the coating was attributed to the limitation of the PVD for coating of structured surfaces.

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

Reference21 articles.

1. Esawy, M., 2011, “Fouling of Structured Surfaces During Pool Boiling of Aqueous Solutions,” Ph.D. thesis, University of Stuttgart, Stuttgart, Germany.http://www.iaea.org/inis/collection/NCLCollectionStore/_Public/44/079/44079139.pdf

2. Heat Exchanger Fouling in Phosphoric Acid Evaporators;Heat Transfer Eng.,2005

3. A New Model for the Effect of Calcium Sulfate Scale Formation on Pool Boiling Heat Transfer;ASME J. Heat Transfer,2004

4. Heat Exchanger Fouling: Cleaning and Mitigation Techniques;Heat Transfer Eng.,2011

5. Model-Based Performance of Turbulence Induced Structures in Exhaust Gas Recirculation (EGR) Coolers;Heat Transfer Eng.,2015

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