Numerical analysis of flow and heat transfer in a shell and tube heat exchanger in the gas recirculation cooling system of a diesel engine and the effect of nanofluid on its performance

2021 ◽  
Author(s):  
Mohammad Rasoul Ahmadi ◽  
Davood Toghraie
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Diesel Engine ◽  
Numerical Analysis ◽  
Cooling System ◽  
Tube Heat Exchanger ◽  
Flow And Heat Transfer ◽  
Shell And Tube ◽  
Gas Recirculation

scholarly journals CFD evaluation of the influence of the parts of a shell and tube heat exchanger on heat transfer

2021 ◽  
Vol 345 ◽  
pp. 00007
Author(s):  
Jiří Frank ◽  
Michal Volf ◽  
Stefan Bajić
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Cooling Water ◽  
Temperature Fields ◽  
Tube Heat Exchanger ◽  
Flow And Heat Transfer ◽  
Design Changes ◽  
Exhaust Fumes ◽  
Shell And Tube ◽  
Effective Use

This article deals with numerical fluid flow and heat transfer simulations of a shell and tube heat exchanger in which cooling water is heated by hot exhaust fumes. This heat exchanger plays a major role in a cogeneration unit, since it is responsible for the effective use of residual heat. The objective of the simulations is to evaluate the effects of various design changes made to the heat exchanger and their influence on the temperature fields and thus on the overall performance and efficiency of the system. In our analysis we looked at the baffles which cause the cross-current flow of water outside the tubes and at the placement of the gas inlet, i.e., on the distribution of the mass flow rate of the exhaust fumes inside these tubes.

scholarly journals Effect of segmental baffles on the shell-and-tube heat exchanger effectiveness

2014 ◽  
Vol 68 (2) ◽  
pp. 171-177 ◽  
Author(s):  
Mica Vukic ◽  
Mladen Tomic ◽  
Predrag Zivkovic ◽  
Gradimir Ilic
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Tube Bundle ◽  
Experimental Investigations ◽  
Shell Side ◽  
Cool Water ◽  
Pressure Drops ◽  
Tube Heat Exchanger ◽  
Flow And Heat Transfer ◽  
Shell And Tube

In this paper, the results of the experimental investigations of fluid flow and heat transfer in laboratory experimental shell-and-tube heat exchanger are presented. Shell-and-tube heat exchanger is with one pass of warm water on the shell side and two passes of cool water in tube bundle. Shell-and-tube heat exchanger is with 24x2 tubes (U-tube) in triangle layout. During each experimental run, the pressure drops and the fluid temperatures on shell side, along the shell-and-tube heat exchanger (at positions defined in advance) have been measured. Special attention was made to the investigation of the segmental baffles number influence of the shell-and-tube heat exchanger effectiveness.

Effects of Baffle Overlap Proportion on Shell-Side Performance of Shell and Tube Heat Exchanger With Helical Baffles

2013 ◽  
Author(s):  
Bin Gao ◽  
Qincheng Bi ◽  
Zesen Nie
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Flow Rate ◽  
Heat Transfer Performance ◽  
Transfer Performance ◽  
Shell Side ◽  
Tube Heat Exchanger ◽  
Flow And Heat Transfer ◽  
Shell And Tube ◽  
Side Flow

Different overlap configurations of discontinuous helical baffles affect the flow pattern of the shell-side fluid directly, and thus there is a significant impact on the flow and heat transfer characteristics of the shell-side fluid. In the present paper, experiments were carried out to study the impact of baffle overlap proportion on the shell-side flow and heat transfer performance of the shell-and-tube heat exchanger with helical baffles (STHEHB). Two different shell-side friction factors, the friction factor per helical pitch (fs,1B) and the friction factor per tube length (fs,1m), were defined based on different reference lengths. The results showed that, since the baffle overlap proportion leads to different helical pitch as well as flow fields in shell side, opposite conclusions are obtained by choosing different reference length. Based on the same Reynolds number, the shell-side Nusselt number of the STHEHB with 10% baffle overlap is higher than that with 50% baffle overlap. The reason is that the larger baffle overlap proportion produces more serious leak flows and weakens the heat transfer in shell side. The comparison of heat transfer coefficient per unit pressure drop versus shell-side flow rate showed that the STHEHB with smaller baffle overlap proportion has better comprehensive heat transfer performance, but the difference between the two decreases gradually with the increase of the flow rate.

Improving shell and tube heat exchanger thermohydraulic performance using combined baffle

2019 ◽  
Vol 30 (8) ◽  
pp. 4119-4140 ◽  
Author(s):  
Ali Akbar Abbasian Arani ◽  
Hamed Uosofvand
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Pressure Drop ◽  
Fluid Dynamic ◽  
Flow Simulation ◽  
Content Type ◽  
Tube Heat Exchanger ◽  
Flow And Heat Transfer ◽  
Helical Baffle ◽  
Shell And Tube

Purpose This paper aims to investigate the fluid flow and heat transfer of a laboratory shell and tube heat exchanger that are analyzed using computational fluid dynamic approach by SOLIDWORKS flow simulation (ver. 2015) software. Design/methodology/approach In this study, several types of baffle including segmental baffle, butterfly baffle, helical baffle, combined helical-segmental baffle, combined helical-disk baffle and combined helical-butterfly baffle are examined. Two important parameters as the heat transfer and pressure drop are evaluated and analyzed. Based on obtained results, segmental baffle has the highest amount of heat transfer and pressure drop. To assess the integrative performance, performance coefficient defines as “Q/Δp” is used. Findings This investigation showed that among the presented baffle types, the heat exchangers equipped with disk baffle has the highest heat transfer. In addition, in the same mass flow rate, the performance coefficient of the shell and tube heat exchanger equipped with helical-butterfly baffle is the highest among the proposed models. Originality/value After combined helical-butterfly baffle the butterfly baffle, disk baffle, helical-segmental baffle and helical-disk baffle show their superiority of 35.12, 25, 22 and 12 per cent rather than the common segmental baffle, respectively. Furthermore, except for the combined helical-disk baffle, the other type of combined baffle have better performance compare to the basic configuration (butterfly and segmental baffle).

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