Numerical investigation on combined multiple shell-pass shell-and-tube heat exchanger with continuous helical baffles

Heat transfer and entropy analysis of three different types of heat exchangers operated with nanofluids

“…Moreover baffles with a 30°helical angle performed better than 20°f or the same inner diameter of shell. Wang et al [22] performed numerical study on a shell and tube heat exchanger with the multiple shell passes. Operating under similar shell pressure drop, it was found that the heat transfer rate of the helical type exchanger was 5.6% better than the segmental one.…”

Numerical Investigation of the Effect of Variable Baffle Spacing on the Thermal Performance of a Shell and Tube Heat Exchanger

“…In this software flow and temperature fields were computed by a three dimensional CFD method. This software solves continuum, energy and transport equations numerically and the coupled algorithm was chosen for pressure-velocity coupling, the k-ε realizable model was used for turbulence modeling and this model was used for such calculations due to stability and precision of the numerical results in the available literature [6,12,[18][19][20][21][22]. The governing equations for steady state conditions are shown below: …”

“…In a baffled shell and tube heat exchanger, the baffles are used for different reasons such as providing support for tubes, obtaining a desirable fluid velocity to be maintained for the shell-side fluid flow, and preventing the tubes from vibrating. They also direct the shell side flow to enhance the heat transfer coefficient but their usage conversely produces an increased pressure drop [6]. Therefore, their dimensions and locations have to be optimized or they have to be replaced with the other types which have better heat transfer efficiency and lower pressure drops [7][8][9][10].…”

Numerical simulation and performance improvement for a small size shell-and-tube heat exchanger with trefoil-hole baffles

“…These tube supports result in the shellside flow patterns completely different from the traditional zigzag one. For instance, helical baffles [10][11][12][13][14] could generate the spiral flow pattern, and they are used as tube supports to induce the shellside fluids spirally flowing across tube bundles, which facilitates large heat transfer rates. Besides, the fluid backmixing is effectively restrained with the helical flow pattern.…”

“…Chen and G.D. Chen, et.al. [10] takes the same method to investigate in the combined multiple shell-pass STHX with helical baffles. It is noted that the fluids on the tube sides in the above two investigations are not included in their numerical models, and tube walls take the thermal boundary condition of constant temperature.…”