Abstract
In this thesis, the numerical solution of navier stockes equations and turbulent equations have also been investigated in fluent software, to investigate baffle type change from cut off to helical in shell and tube heat exchanger. RNG K-e turbulence model was used to perturbations modelling. The main objective of baffle changing in thesis is increasing propane temperature in pipes outlet. 4 heat exchanger type with different helical angles (35, 40, 45 and 50) compared with simple baffle type. Studies indicate that heat exchanger with helical angle of 50°, maximum outlet temperature of propane will result and have the maximum heat transfer rate in shell. Exchangers with helical angle of 40 degrees have the highest ratio h / Δp, which reflects the heat transfer rate to pressure drop ratio.
Highlights
The first model that is segmental baffle, is tried to be a model, like to industrial exchanger used in south pars gas complex
Considering Fluid flow is turbulent in exchanger, one of the important parts of research, turbulence model is the right choice. for this purpose, three turbulence models RNG K-ε ، K-ω Standard and SST K-ω was checked for exchanger with segmental baffle and the number of cells by 3500000, that in the three solutions, propane temperature output accuracy and speed convergence of three models, were compared together
In this research using numerical solution effect of changing baffle from segmental state to helical state for an industrial exchanger was studied. affect of change of helical angle on heat transfer and pressure drop was studied. using network study found that network with 3500000 computational cells is the best option for the numerical solution this exchanger
Summary
Equipments used in the heat transfer, defined, according to the operation in the process of doing. heat exchanger, heat between two streams of the process to recovery. steam and cold water are used as ancillary services but such as streams can recover them in the process, not studied. Heat exchanger, heat between two streams of the process to recovery. Steam and cold water are used as ancillary services but such as streams can recover them in the process, not studied. Heaters for heating of fluids used in the process and often from steam water as the heating fluids is used. Condenser is kind of cooling but the purpose of using it is to take of the fluid sensible heat. The purpose of the use of the reboiler, is the necessary heat supply in distillation process as latent heat. A shell and tube heat exchanger that used the two fluids of water steam in the shell and propane in the tube, the numerical analysis are considered
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