Thermal performance in square-duct heat exchanger with quadruple V-finned twisted tapes.
Author(s) : PROMVONGE P.
Type of article: Article
Summary
An investigation on heat transfer augmentation in a square duct with insertion of combined 30° V-fins and quadruple counter-twisted tapes is conducted experimentally. Air as the working fluid enters the test duct having a uniform wall heat-flux condition with Reynolds number ranging from 4000 to 30,000 in the present work. The combined vortex generators (called “V-finned counter-twisted tape”) are obtained by incorporating V-fins into the edges of quadruple twisted-tapes having a similar twist ratio of 4. The effect of pertinent V-fin parameters such as four relative fin height, (RB = e/w = 0.16, 0.21, 0.32 and 0.42) and relative fin pitch, (RP = P/w = 4, 8, 12 and 16) at a single fin attack angle, a = 30° on thermal characteristics is examined. The experimental results reveal that the heat transfer and pressure drop in the form of respective Nusselt number and friction factor from the V-finned counter-twisted tape tend to increase with the rise of RB but show the reversing trend with increasing RP. The thermal performance of the V-finned counter-twisted tape is considerably higher than that of the quadruple twisted tapes alone. The V-finned counter-twisted tape with RB = 0.42 and RP = 4 yields the maximum Nusselt number and friction factor but the one with RB = 0.21 and RP = 4 provides the highest thermal performance of about 1.75 at lower Reynolds number.
Details
- Original title: Thermal performance in square-duct heat exchanger with quadruple V-finned twisted tapes.
- Record ID : 30017153
- Languages: English
- Source: Applied Thermal Engineering - vol. 91
- Publication date: 2015/12/05
- DOI: http://dx.doi.org/10.1016/j.applthermaleng.2015.08.047
Links
See other articles in this issue (57)
See the source
Indexing
-
An assessment of the optimal air-side thermal-h...
- Author(s) : QASEM N. A. A., ZUBAIR S. M.
- Date : 2018/12
- Languages : English
- Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 96
- Formats : PDF
View record
-
Measure system on fins processing quality of pl...
- Author(s) : SHU J., HUANG G., LIU W., et al.
- Date : 2010/06/07
- Languages : English
- Source: ACRA2010. Asian conference on refrigeration and air conditioning: Tokyo, Japan, June 7-9, 2010.
- Formats : PDF
View record
-
Thermo-hydraulic performances of internally fin...
- Author(s) : PENG H., LIU L., LING X., et al.
- Date : 2016/04/05
- Languages : English
- Source: Applied Thermal Engineering - vol. 98
View record
-
Thermal contact resistance in plate fin-and-tub...
- Author(s) : TALER D., OCLON P.
- Date : 2014/10
- Languages : English
- Source: International Journal of thermal Sciences - vol. 84
View record
-
Condensate impact on air friction of plate fin-...
- Author(s) : YU J.
- Date : 2021/05
- Languages : English
- Source: 2021 Purdue Conferences. 18th International Refrigeration and Air-Conditioning Conference at Purdue.
- Formats : PDF
View record