Numerical Simulation For A Shell-and-tube Heat Exchanger And Research On Structural Optimization

Because of it’s simply manufacture and low cost traditional single segment baffle heat exchanger is wide applied.But it’s shell side pressure drop is bigger,a big flow dead zone in the back of the baffle and it is easy to scale.In order to improve the traditional tube-and-shell heat exchanger’s heat transfer efficiency, reduce it’s energy consumption,save energy and protect the environment,the structure optimization to the traditional tube-and-shell heat exchanger’s baffle has important practical significance. Three different structure optimization to the traditional tube-and-shell heat exchanger was done and compared with the traditional single segment baffle heat exchanger.Use two sets of schemes to study three kinds of baffle opening shape by numerical simulation method,the first set of scheme choose same hydraulic diameter and the second set of scheme choose same circulation area. Find in the first set of scheme, the triangular opening’s effect is best and the the circular opening’s effect is worst. In the second set of scheme, if shell side inlet velocity is higher, the triangle and the square opening have similar effect and is better than circular opening’s effect; if shell side inlet velocity is lower, the square opening’s effect is better than the triangle opening’s effect, the the circular opening’s effect is worst. A new type of baffle plate heat exchanger is put forward which name is spherical baffle heat exchanger. Numerical analysis and study for the different spherical baffle heat exchanger’s shell side fluid flow condition and heat exchanger performance were done.Results of the research indicate that the smaller of the baffle curvature radius,the bigger of (?)/Δp which is the heat exchanger’s shell side heat transfer and flow resistance comprehensive performance, the (?)/Δp of the spherical baffle heat exchanger with the radius of curvature is0.75D improved8.5%than the conventional segmental baffle heat exchanger’s.The novel sextant flower baffled heat exchanger is a new type support structure heat exchanger. Numerical analysis and study the sextant flower baffled heat exchanger’s detailed shell-side fluid flow and heat transfer performances and do the same study to the traditional baffle heat exchanger.Results show that the heat transfer effect of the sextant flower baffled heat exchanger is better than that of the traditional baffle heat exchanger.The research result provided a basis in theory for the tube-and-shell heat exchanger’s bracing structure optimization and also provide certain reference significance for the actual engineering application.