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Identification of the flow pattern of liquid streams in the shell-side of a segmental-baffled shell-and-tube heat exchanger

Ligus G., Zając D., Kołodziej S.

Journal of Mechanical and Energy Engineering

2018

Vol. 2, No 3

245--256

Shell-and-tube heat exchangers are widely used in chemical and process engineering. Assessing hydrodynamics of fluid flow in their shell-side is a highly complex task. This results from the complex geometry of the shell-side itself, defined by such parameters as the tubesheet layout, tube diameter, baffle spacing or baffle cut. Shell-and-tube heat exchangers are the subject of many studies in which design and flow parameters are analysed. However, only a few studies concentrate on issues strictly related to the identification of streams of the liquid flowing in the shell-side of apparatus on an industrial scale. In this article, the authors present the results of an experimental visualization study, utilizing Particle Image Velocimetry (PIV). The experiment used a laser sheet technique along and across a tube bundle. The main results of the measurements and analyses concentrate on identifying the flow pattern of streams in the shell-side and assessing stagnation vortices and their consequences. Finally, detecting bypass streams and leakage streams flowing through design gaps between the shell and the tube bundle as well as between the baffles and the tubes in the bundle are presented.

Thermal Resistance of Steam Condensation in Horizontal Tube Bundles

Grzebielec A., Rusowicz A.

Journal of Power Technologies

2011

Vol. 91, nr 1

41-48

This paper presents calculated heat transfer coefficients for water vapor condensation on horizontal tubes. The influence of vapor, cooling water and noncondensable gases properties on heat transfer process are presented. Two types of condensers are analyzed. One of them is a power plant condenser; the second is an absorption refrigerator condenser where the working pair is water and Lithium Bromide (LiBr). Results for tubes selected from different places in tube banks from both types of condensers are compared.