Experimental study of thermo-hydraulic and fouling performance of enhanced heat exchangers |
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Authors: | H Pahlavanzadeh MR Jafari Nasr SH Mozaffari |
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Affiliation: | 1. Chemical Engineering Department, Tarbiat Modares University, Jalal Al Ahmad Highway, Tehran, Iran;2. Research and Technology Petrochemical Company, South Shiraz, Mollasadra, Tehran, Iran |
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Abstract: | The present study investigated the effect of two tube inserts (wire coil and wire mesh) on the heat transfer enhancement, pressure drop and mineral salts fouling mitigation in tube of a heat exchanger. A 3/4-in. tube that is heated by band heaters, is used which simulated a tube of heat exchanger. Working fluid is water with certain quality. The heat transfer rate averagely increased by 22–28% for wire coil (p/d = 0.125, e/d = 0.00375) and 163–174% for wire mesh (medium density) over a plain tube value, depending on type of tube insert, density of wire torsion and flow velocity. However, the pressure drop also increased substantially by 46% for wire coil and 500% for wire mesh. Wire coil insert with vibration mitigate mineral salts fouling (scaling) about 34%, and wire mesh have no effect on scaling, however it sometimes increased deposit rate. |
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Keywords: | Tube insert Heat transfer enhancement Fouling mitigation Pressure drop Friction factor Wire coil Wire mesh |
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