Experimental Study on Oil to Water Heat Transfer Performance of Circumferential Overlap Trisection Helical Baffle Heat Exchangers

Abstract

Experimental study on heat transfer performance of circumferential overlap trisection helical baffle heat exchangers of tilt angles 12°, 16°, 20°, 24°and 28° compared with a segmental baffle heat exchanger are conducted. The testing heat exchangers are constructed of a common cylinder case and replaceable tube bundle cores. The hot fluid is heat transfer oil with about 70 ℃ in the shell side and the cold fluid is cooling water with about 11 ℃ in the tube side. The results show that within the testing range, the overall heat transfer coefficient, the shell side heat transfer coefficient, pressure drop as well as comprehensive indexes ho/Δpo and ho/Δpo1/3 decrease with the increase of the tilt angle of the baffles, and the optimum scheme is the one with baffle tilt angle of 12°, and the ratios of the mean values of the shell side heat transfer coefficient ho, comprehensive index ho/Δpo and ho/Δpo1/3 of the helical scheme with baffle tilt angle of 12° over those of the segmental baffle scheme are 1.253, 1.391 and 1.285, respectively.