Experimental investigation on enhanced heat transfer in transversally corrugated tube with molten salt

Experimental study was performed for enhanced heat transfer of mixed molten Hitec salts in transversally corrugated tubes with three different sets of structural parameters. A general correlation was obtained for transversally corrugated tubes, the maximum deviation between fitting correlation and the experimental data is +17%. The variation of drag coefficient vs. Re number was determined in the smooth tube and transversally corrugated tubes, the drag coefficient for transversally corrugated tubes is larger than that for smooth tube. Based on comparison of three kind criterions, the comprehensive enhanced effect of the transverselly corrugated tube with P = 9 is higher than that of P = 5 and P = 16.

The general correlation between Nu and Re for transversally corrugated tubes.Figure optionsDownload as PowerPoint slideHighlights
► A general correlation was derived for transversally corrugated tubes with maximum deviation of +17%.
► The drag coefficient for transversally corrugated tubes was determined.
► Good agreement between the experimental data and fitting correlations was discovered.