EXPERIMENTAL STUDY OF FOULING MITIGATION AND HEAT TRANSFER ENHANCEMENT WITH WIRE COIL INSERTS

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JAFARI NASR M.R.; PAHLAVANZADEH H.; Mozaffari S.H.

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Seminar Paper

Paper Information

Seminar: CHEMICAL ENGINEERING CONGRESS AND EXHIBITION
Year:2008 | Issue:5

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Title

EXPERIMENTAL STUDY OF FOULING MITIGATION AND HEAT TRANSFER ENHANCEMENT WITH WIRE COIL INSERTS

Author(s)

JAFARI NASR M.R. | PAHLAVANZADEH H. | Mozaffari S.H.

Keywords

WIRE COIL INSERTS

FOULING MITIGATION

HEAT TRANSFER ENHANCEMENT

FRICTION FACTOR

Abstract

TUBE INSERTS ARE USED AS HEAT TRANSFER ENHANCEMENT DEVICES IN APPLICATIONS: RETROFITTING AND NEW DESIGN OF SHELL AND TUBE HEAT EXCHANGERS. IN THIS PAPER, HELICAL-WIRE-COILS FITTED INSIDE A ROUND TUBE HAVE BEEN EXPERIMENTALLY STUDIED IN ORDER TO CHARACTERIZE THEIR THERMO HYDRAULIC AND FOULING BEHAVIORS IN TURBULENT FLOW REGIME. THE PRESENT STUDY INTRODUCES A NEW EXPERIMENTAL METHOD TO REVEAL FOR THE FOULING PROCESS OF CACO3 (CRYSTALLIZATION MECHANISM FOR WATER) AND TO STUDY THE EFFECT OF WIRE COIL INSERTS ON FOULING RESISTANCE OF CACO3, HEAT TRANSFER COEFFICIENT AND FRICTION FACTOR. THE FOULING EXPERIMENTS WERE PERFORMED WITH THE REYNOLDS NUMBER SET AT 12,824 WHICH IS CORRESPONDENT TO THE FLOW VELOCITY OF 0.66 M/S IN THE TEST SECTION. THE INLET BULK TEMPERATURE WAS 39OC AND WITH AVERAGE TOTAL HARDNESS 245. BY ADDING OF CALCIUM CHLORIDE (CACL2) AND BICARBONATE SODIUM (NAHCO3) CONTINUOUSLY TO WATER TANK, THE AVERAGE TOTAL HARDNESS KEEP ALMOST CONSTANT. FOULING RESISTANCE RESULTS REPORT FROM THREE WIRE COIL INSERTS WITHIN A GEOMETRICAL RANGE OF HELICAL PITCH 0.1375<P/D<0.2813 AND WIRE DIAMETER 0.0238<E/D<0.0750. THE HEAT TRANSFER AND PRESSURE DROP ARE RESULTS FROM WIRE COILS ARE SHOWN IN TURBULENT FLOW REGIME WITHIN A WIDE FLOW RANGE: 4000<RE<52000 AND ALMOST CONSTANT PRANDTL NUMBER (PR=3.15-4.55). WE PROPOSED A MATHEMATICAL RESTATEMENT ON KERN AND SEATON FOULING MODEL FOR PLAIN AND ENHANCED TUBE (WITH WIRE COIL TYPE1). ALSO NUSSELT NUMBER AND ISOTHERMAL FRICTION FACTOR CORRELATIONS ARE PROPOSED FOR TURBULENT REGIME IN TERMS OF REYNOLDS NUMBER (RE>4500) AND INSERTS GEOMETRY.

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Cite

APA: Copy

JAFARI NASR, M.R., PAHLAVANZADEH, H., & Mozaffari, S.H.. (2008). EXPERIMENTAL STUDY OF FOULING MITIGATION AND HEAT TRANSFER ENHANCEMENT WITH WIRE COIL INSERTS. INTERNATIONAL CHEMICAL ENGINEERING CONGRESS AND EXHIBITION. SID. https://sid.ir/paper/908639/en

Vancouver: Copy

JAFARI NASR M.R., PAHLAVANZADEH H., Mozaffari S.H.. EXPERIMENTAL STUDY OF FOULING MITIGATION AND HEAT TRANSFER ENHANCEMENT WITH WIRE COIL INSERTS. 2008. Available from: https://sid.ir/paper/908639/en

IEEE: Copy

M.R. JAFARI NASR, H. PAHLAVANZADEH, and S.H. Mozaffari, “EXPERIMENTAL STUDY OF FOULING MITIGATION AND HEAT TRANSFER ENHANCEMENT WITH WIRE COIL INSERTS,” presented at the INTERNATIONAL CHEMICAL ENGINEERING CONGRESS AND EXHIBITION. 2008, [Online]. Available: https://sid.ir/paper/908639/en

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