Abstract
The thermohydraulic performance in a tube containing a modified twisted tape with alternate-axes and wing arrangements is reported. This work aims to investigate the effects of wing arrangements (opposite (O) and parallel (P) wings) at different wing shapes (triangle (Tri), rectangular (Rec), and trapezoidal (Tra) wings) and on the thermohydraulic performance characteristics. The obtained results show that wing twisted tapes with all wing shape arrangements (O-Tri/O-Rec/O-Tra/P-Tri/P-Rec/P-Tra) give superior thermohydraulic performance and heat transfer rate to the typical twisted tape. In addition, the tapes with opposite wing arrangement of O-Tra, O-Rec, and O-Tri give superior thermohydraulic performances to those with parallel wing arrangement of P-Tra, P-Rec, and P-Tri around 2.7%, 3.5%, and 3.2%, respectively.
Highlights
In recent years, heat transfer enhancement in heat exchangers has been intensively investigated in order to optimize the condition and configuration of heat transfer system
The thermohydraulic results of a tube installing with triangle/rectangular/trapezoidal wing twisted tape in both of the opposite and parallel wing arrangements (O-Tri/O-Rec/opposite arrangement (OTra)/P-Tri/P-Rec/P-Tra) are examined and reported along with those in the tubes with typical twisted tape (TT) and twisted tape with alternate-axes (TA) as well as the plain tube alone
All modified with triangle/rectangular/trapezoidal wings of this study possess considerably higher heat transfer rate than the typical twisted tape (TT)
Summary
Heat transfer enhancement (heating/cooling) in heat exchangers has been intensively investigated in order to optimize the condition and configuration of heat transfer system. Some modifications of the twisted tapes were conducted principally to suppress an increase of pressure drop in tubes; the modified twisted tapes in this group include the loose-fit twisted tape [1, 2], regularly spaced tape element [3, 4], short-length twisted tape [5], twisted tape with spacer at the trailing edge [6], and wing twisted tapes [7]. Numerous modified twisted tapes with different geometrics for heat transfer enhancement have been proposed [18,19,20,21,22,23,24,25,26] such as multiple short-length twisted tape [18], rectangular-cut twisted tape [19], perforated twisted tape [20], regularly spaced twisted tape with rod and spacer [21], nonuniform twisted tapes [22], quadruple co/countertwisted tapes [23], circular duct having integral spiral corrugation roughness and fitted with twisted tapes with oblique teeth [24], centre-cleared twisted tapes in combination with integral transverse corrugation [25], and louvered twisted tape [26], respectively
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