Retardation of heat exchanger surfaces mineral fouling by water-based diethylenetriamine pentaacetate-treated CNT nanofluids. (5th January 2017)

• Record Type: Journal Article
• Authors: Teng, K.H.; Amiri, Ahmad; Kazi, S.N.; Bakar, M.A.; Chew, B.T.; Al-Shamma'a, A.; Shaw, A.
• Is Part Of: Applied thermal engineering. Volume 110(2017:Jan.)
• Page Start: 495
• Page End: 503
• Publication Date: 2017-01-05
• Subjects: Calcium carbonate -- Crystallization fouling -- Fouling mitigation -- MWCNT-based water -- DTPA; Heat engineering -- Periodicals; Heating -- Equipment and supplies -- Periodicals; Periodicals; 621.40205
• DOI: 10.1016/j.applthermaleng.2016.08.181
• Languages: English
• ISSNs: 1359-4311

Abstract

Highlights: Decoration EDTA on MWCNT surface to retard the rate of fouling. Preparation of DTPA-treated MWCNT/water nanofluid. Evaluating the mitigation of DTPA-treated MWCNT-based water nanofluids. Retarding of calcium carbonate crystals by MWCNT-DTPA additives. The effect of additive on the rate of fouling. Abstract: Mineral scale deposition on heat exchanging surfaces increases the thermal resistance and reduces the operating service life. The effect is usually intensified at higher temperatures due to the inverse temperature solubility characteristics of some minerals in the cooling water. Scale formation build up when dissolved salt crystallize from solution onto the heated surface, forming an adherent deposit. It is very important for heat transfer applications to cope with the fouling problems in industry. In this present study, a set of fouling experiments was conducted to evaluate the mitigation of calcium carbonate scaling by applying DTPA-treated MWCNT-based water nanofluids on heat exchanger surfaces. Investigation of additive DTPA-treated MWCNT-based water nanofluids (benign to the environment) on fouling rate of deposition was performed. 300 mg L −1 of artificially-hardened calcium carbonate solution was prepared as a fouling solution for deposit analysis. Assessment of the deposition of calcium carbonate on the heat exchanger surface with respect to the inhibition of crystal growth was conducted by Scanning Electron Microscope (SEM). The results showed that the formation of calcium carbonate crystals can be retarded significantly by adding MWCNT-DTPA additives as inhibition in the solution.