Numerical comparison study on heat transfer enhancement of different cross-section wire coils insert with varying pitches in a duct
نویسندگان
چکیده
Heat transfer enhancement (HTE) efforts spent during the last half-century have become one of most important working areas researchers from both academia and industry. One popular passive methods, with regard to price-performance ratio, is place wire coils in a pipe or duct. In this study, heat pressure drop characteristics diamond, triangular, circular cross-sectional (DWC, TWC, CWC) square duct were investigated by using FLUENT program. addition cross-section examination, thermo-hydraulic behavior three different pitches (p = 54, 72, 90 mm) for specified geometries also investigated. The Reynolds number was between 4387 18,415. 1.25 m length, 18 mm diameter. results showed that Nusselt CWC, DWC higher than smooth within 38–88%, 37–93%, 38–98% range, respectively. friction observed be plain tube range 87–278%, 82–266%, 107–366%, TWC pitch highest performance evaluation criteria (PEC) coefficient 1.3 at 4504, whereas 54 show lowest PEC. Thus, as-obtained PEC, which 30% tube, indicates prominence effectiveness numerical study increasing transfer.
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متن کامل
Heat Transfer from a Tube Bank in Cross Flow in a Duct
An experimental investigation on heat transfer coefficient is presented from three horizontal tubes in a vertical array in a duct for 500<ReD<6000. A mass transfer measuring technique based on psychrometry chart is used to determine heat transfer coefficient. The diameter of the tubes is 11 mm each spaced 40 mm apart and in-line pitch ratio varies 
in the range 0.055<D/W<0.22. The experimen...
متن کاملHeat Transfer from a Tube Bank in Cross Flow in a Duct
An experimental investigation on heat transfer coefficient is presented from three horizontal tubes in a vertical array in a duct for 500<ReD<6000. A mass transfer measuring technique based on psychrometry chart is used to determine heat transfer coefficient. The diameter of the tubes is 11 mm each spaced 40 mm apart and in-line pitch ratio varies in the range 0.055<D/W<0.22. The experimenta...
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ژورنال
عنوان ژورنال: Journal of Thermal Engineering
سال: 2021
ISSN: ['2148-7847']
DOI: https://doi.org/10.18186/thermal.1025930