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Energies 2022, 15, 1316 13 of 22 Figure 15. Results of helically finned tubes, pitch 9 mm, fin thickness 2 mm, TRINI test rig, 146 μm particles. Indices 1 and 2 refer to the different heated tubes. Figure 16. Results of helically finned tubes, pitch 9 mm, fin thickness 1 mm, TRINI test rig, 146 μm Figure 16. Results of helically finned tubes, pitch 9 mm, fin thickness 1 mm, TRINI test rig, 146 μm particles. Indices 1 and 2 refer to the different heated tubes. particles. Indices 1 and 2 refer to the different heated tubes. A similar discrepancy between the results of the two heated tubes can be observed as with the plain tubes, though the ffiirst tube shows better results than the second tube in Energies 2022, 15, x FOR PEER REVIEW 14 of 22 the case of the 1 mm thick ffiins. A diirect comparison between the two ffiin conffiigurations is shown in Figure 17. Figure 17. Comparison between 1 mm and 2 mm thick helical fins, TRINI test rig, 146 μm Figure 17. Comparison between 1 mm and 2 mm thick helical fins, TRINI test rig, 146 μm particles. particles. The results represent the mean values between the two tubes in the respective con- figuraTthioenr.eCsuleltasrlyre,pthres2enmtmthtehimckeafinsvsahluoewshbiegthweereHnTtChesitnwgoentuebraelsaindtahemroersepsetcatbivle ncoetnHfigTuCrathtiaon.thCele1armlym, ththeic2kmfimnst,hwichkicfihnisssnhotwsuhripgrhiesrinHgTgCivsein tgheenleorwalearnfidnaemffiocriensctaybolef tnheitnnHeTrCfinthsa[n18t]h(epp1.m12m73t–h1ic2k74f)i.ns, which is not surprising given the lower fin efficiency ofthTinhneerefsiunlsts[1o8f]t(hpepl.a1s2t7fi3n–1co27n4fi)g.urationwithafinspacingof6mmandafinthickness of 1 mTmhearresushltoswofntihneFlaigsut frien1c8o.nfiguration with a fin spacing of 6 mm and a fin thickness of 1 mThmisairsetsheoownnlyingFraigpuhrew1h8e.re a first order polynomial was used for the regression analysis. The results of this experiment are inconsistent with the previous results (the gross heat transfer coefficient decreases with increasing degree of fluidization) and show a much greater variability. It is believed that the small distance between the fins caused local disturbances in the sand flow, leading to bad results. The results of this experiment are therefore not taken into account.PDF Image | Heat Transfer between Finned Tubes
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