Investigations on crystallization fouling on PEEK films used as heat transfer surfaces: experimental results

Ataki, Adel; Kiepfer, Hendrik; Bart, Hans‐Jörg

doi:10.1007/s00231-019-02769-w

Cited by 15 publications

(2 citation statements)

References 23 publications

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“…It has been shown by Dreiser that the adhesion force of calcium sulfate scales is 10–20 times lower on polymeric PEEK films in comparison to an S.S. surface. In addition, this effect could also be demonstrated for the calcium carbonate test system . At this point, it is also possible to establish a reference to the equations set out in Sect.…”

Section: Resultsmentioning

confidence: 99%

Polymer Film Heat Transfer Surfaces in Seawater Desalination: Fouling Layer Formation and Technology

et al. 2020

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The emerging polyether ether ketone (PEEK) films were evaluated as future heat exchanger materials in seawater thermal desalination processes. Fouling resistance curves were measured in a pilot plant for pure PEEK films, talcum-filled PEEK films, and stainless-steel films with artificial seawater, showing that pure PEEK films have the advantage of weaker forces of adhesion or cohesion between the scaling materials and the film surface. Increasing the flow rate from 18 to 24 L min -1 results in decreases of both the fouling rate and the asymptotic values. This was attributed to the lower polarity of 10.4 %, the lower arithmetic average roughness of 0.06 μm, and the homogeneous topography of the PEEK film. This polymer film is adaptable to in situ cleaning in thermal seawater desalination processes.A combined automatic control and instrumentation system for the volumetric flow rate (F), the bulk seawater temperature (T B ), and the hot surface temperature (T S ) is installed to enable

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Section: Resultsmentioning

confidence: 99%

Polymer Film Heat Transfer Surfaces in Seawater Desalination: Fouling Layer Formation and Technology

et al. 2020

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“…The heat transfer and scaling formation measurements were performed using a home-made setup, schematically depicted in Scheme 1, and described in more detail elsewhere [23]. The test cell (4) is a mini polymer film heat transfer cell (PFHX) operating at counter-current flow with a heat transfer area of about 32 cm 2 .…”

Section: Heat Transfer and Scaling Measurementmentioning

confidence: 99%

Thermally Conductive Polyethylene/Expanded Graphite Composites as Heat Transfer Surface: Mechanical, Thermo-Physical and Surface Behavior

et al. 2020

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Composites of high-density polyethylene (HDPE) and expanded graphite (EG) are prepared for heat exchangers in multi-effect distillation (MED) desalination. At 50 wt.% EG loading, the thermal conductivity of HDPE was increased by 372%. Moreover, the surface wettability of the HDPE/EG composite was enhanced by corona and RF plasma treatment as demonstrated by the increase in surface free energy from 28.5 mJ/m2 for untreated HDPE/EG to 55.5 and 54.5 mJ/m2 for HDPE/EG treated by corona and RF plasma, respectively. This enhanced surface wettability was retained over a long time with only a 9% and 18% decrease in RF and corona plasma-treated samples’ surface energy after two months. The viscoelastic moduli and the complex viscosity profiles indicated that EG content dictates the optimum processing technique. At loading below 30 wt.%, the extrusion process is preferred, while above 30 wt.% loading, injection molding is preferred. The plasma treatment also improved the HDPE/EG composite overall heat transfer coefficient with an overall heat transfer coefficient of the composite reaching about 98% that of stainless steel. Moreover, the plasma-treated composite exhibited superior resistance to crystallization fouling in both CaSO4 solution and artificial seawater compared to untreated composites and stainless-steel surfaces.

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Inhibition of adhesion of CaCO₃ scale by polydopamine/polytetrafluoroethylene coating with stability and anticorrosion properties

Wang

et al. 2021

J of Applied Polymer Sci

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Reduction of calcium carbonate (CaCO 3 ) scale formation on the equipment surface is essential in a wide variety of industrial fields. In this work, polydopamine/polytetrafluoroethylene (PDA/PTFE) coating prepared by the simple immersion on stainless steel (SS) surfaces was developed to suppress the CaCO 3 scale adhesion. The PDA/PTFE-coated surface showed the higher hydrophobicity (water contact angle = 133.50 ) and lower surface free energy (11.92 mN/m) than the stainless-steel surface. The scale inhibiting rate of the coated surface was up to 76.8% after 12-hour immersion in the CaCO 3 solution in comparison with the untreated SS. More bubbles were observed on the PDA/PTFE-coated surfaces, and the number of bubbles increased with increasing solution temperature leading to less area for the scale adhesion. As a result, the PDA/PTFE coated surfaces have the higher antiscale ability at the higher solution temperature. Furthermore, the stripping and electrochemical corrosion tests demonstrated that the PDA/PTFE coating has the better stability and anticorrosion ability. The PDA/PTFE coating with the superior properties has potential application for the long-lasting reduction of the scale formation.

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Investigations on crystallization fouling on PEEK films used as heat transfer surfaces: experimental results

Cited by 15 publications

References 23 publications

Polymer Film Heat Transfer Surfaces in Seawater Desalination: Fouling Layer Formation and Technology

Polymer Film Heat Transfer Surfaces in Seawater Desalination: Fouling Layer Formation and Technology

Thermally Conductive Polyethylene/Expanded Graphite Composites as Heat Transfer Surface: Mechanical, Thermo-Physical and Surface Behavior

Inhibition of adhesion of CaCO₃ scale by polydopamine/polytetrafluoroethylene coating with stability and anticorrosion properties

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Investigations on crystallization fouling on PEEK films used as heat transfer surfaces: experimental results

Cited by 15 publications

References 23 publications

Polymer Film Heat Transfer Surfaces in Seawater Desalination: Fouling Layer Formation and Technology

Polymer Film Heat Transfer Surfaces in Seawater Desalination: Fouling Layer Formation and Technology

Thermally Conductive Polyethylene/Expanded Graphite Composites as Heat Transfer Surface: Mechanical, Thermo-Physical and Surface Behavior

Inhibition of adhesion of CaCO3 scale by polydopamine/polytetrafluoroethylene coating with stability and anticorrosion properties

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Inhibition of adhesion of CaCO₃ scale by polydopamine/polytetrafluoroethylene coating with stability and anticorrosion properties