Influence of fins designs, geometries and conditions on the performance of a plate-fin heat exchanger-experimental perspective

Ma’arof, Muhammad Izzat Nor; Chala, Girma T.; Husain, Hazran; Mohamed, Muhammad Syafiq Syed

doi:10.15282/jmes.13.1.2019.02.0372

Cited by 13 publications

(8 citation statements)

References 18 publications

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“…A study of conjugate heat transfer of natural and forced convection through horizontal thin plates has been under investigation since year of 1960. This area of study covers broad spectrum of engineering aspects, such as thermal effect of solar receiver [1], thermal performance of solar heater [2], convective heat transfer of impinging jets [3], cooling of mixed convection jet impingement [4], heat transfer and flow characteristics of plate heat exchanger [5], thermal influence of geometric design of plate fin [6] and many others.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the effect of different materials on convective heat transfer

Ibrahim¹,

Chong²,

Rajasekharan³

et al. 2020

JMES

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Conventionally, the study of convection heat transfer merely focuses on the behavior of air flow without considering the conductive effect of the horizontal flat plate. However, it is expected that the conductive effect of the horizontal plate somewhat affects the air flow temperature across the flat plate. Therefore, it is motivated to study the variation of air flow temperature across different materials of flat plate in various time frame. The materials used in this study are aluminium, stainless steel and cast iron. Infrared camera and FloEFD simulation software are used to measure the upper surface temperature of the flat plate. For forced convection, the study is carried out within the range of 103 £ Re £ 104 and within the range of 1 × 107 £ Ra < 2.2 × 107 for natural convection. Flow velocity of 2.3 m/s, 4.1 m/s and 5.2 m/s are used for the forced convection. The results showed that aluminium plate cools down faster than the other two metal plates used in all scenarios. Stainless steel’s temperature goes down faster compared to cast iron. These results were supported by the fact that aluminium has higher heat transfer rate of other metals. For forced convection, the discrepancies of temperatures between experimental and simulation studies are below 10%, which demonstrates that the results are reasonably acceptable. For natural convection, even though the discrepancies between simulation and experimental results on temperature variations are relatively large, the temperatures varied in similar pattern. This indicates that the results are reliable.

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Section: Introductionmentioning

confidence: 99%

Investigation of the effect of different materials on convective heat transfer

Ibrahim¹,

Chong²,

Rajasekharan³

et al. 2020

JMES

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“…carried experimental research on heat exchangers with segmental baffles and the two-section, the model with two sections reported was 20 to 30% more efficient than that of the segmental baffle under the same operating conditions. Ma'arof et al [7]. Investigates the effects of diverse designs default, angled, perforated and coated for the rate of heat transfer in heat exchanger, the coating on the fins was decreasing the temperature at a much higher margin at all fan speeds.…”

Section: Introductionmentioning

confidence: 99%

Effect of Spacing Between Baffles on the Dynamic and Thermal Behavior of Water in a Shell-and-Tube Heat Exchanger

Youcef¹,

Saïm²

2022

RCMA

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A numerical simulation of a turbulent flow of water in three shell and tube heat exchangers equipped with 6, 8, 10 segmental baffles as the working fluid at Reynolds numbers ranging from 24327, 33356, 42569 are performed. The conservation equations of mass, momentum and energy are solved by the finite volume method based on the SIMPLE algorithm for coupling velocity-pressure, the mathematical model k-ε within the Fluent software is used in the different cases presented. The temperature, the velocity, the friction factor, the heat transfer coefficient, the pressure drop in the shell, the total heat transfer rate between the tubes and the fluid, the overall performance factor are studied for the three spacing between baffles. This work contributes largely to the understanding of turbulent flows and also shows the effect of the baffles number on the heat transfer in the heat exchangers. The velocity of flow in the shell increases by 1.49% and 1.62% and 1.73% of the reference velocity. The results show an increase in the outlet temperature, heat transfer coefficient 1.09% and 1.28%, pressure drop 1.7% and 2.82%, the total heat transfer rate 1.08% and 1.18% because of the increase in number of baffles. The results obtained in this study are in good agreement and correspond to the results given by the literature.

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“…Therefore, by using numerical simulation, the life of these joints can be predicted and this analysis can be used as guide for preventive design of PFHE. Generally, the plain type of fin in PFHE is used in the LNG industry but with challenging industry requirements, more efficient designs and configurations of PFHE are introduced which can improve the heat-transfer rate [9]. With these improved designs in heat exchangers, high productivity rates and large thermal gradients in smaller sizes, PFHE are now more vulnerable to stresses especially in the brazed joints due to changes in the geometry of the fin.…”

Section: Introductionmentioning

confidence: 99%

Predicting the Structural Reliability of LNG Processing Plate-Fin Heat Exchanger for Energy Conservation

et al. 2020

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Liquefied natural gas (LNG) is one of the hydrocarbon fuels with the least carbon footprint having a rapidly rising global share in the prime energy market. LNG processing for transportation at longer distances works under cryogenic conditions, especially when used for liquefaction and gasification applications. The supply chain of the eco-environmental friendly hydrocarbon is heavily dependent on the processing plant used for liquefaction and subsequent re-gasification of the natural gas. Plate-fin heat exchangers are extensively used in the LNG industry for both re-gasification as well as liquefaction processes. The exchange of heat during the process of natural gas phase change involves plate-fin heat exchangers working under cryogenic low-temperature conditions. The heat exchangers are designed to have brazed joints that are most vulnerable to failure under these temperature conditions. One failure of such a joint can not only hinder the supply chain but also may result in fire and life hazards. In almost all earlier studies, analytical and numerical methods were used to analyze these braze joints using finite element method methods and examining the stresses while keeping them at or near to ambient conditions. In this research, the plate-fin heat exchanger is investigated for its structural stability of brazed fins for three different fin configurations: plain, wavy and compound having different joint geometries. In addition, the analyses are carried out using experimentally measured brazed joint strength which is measured to be on average 22% lower than the base material strength owing to brazing process and resultant heat-affected zone (HAZ). Therefore, the reliability is assessed for these joints in terms of factor of safety (FOS) while keeping in view the actual yield criteria. It was found that the structural stability of compound fins configuration is weakest amongst all considered fin configurations. The failure of the compound fin brazed joint is expected to be along the horizontal path of the joint due to yielding. The study also predicts the life of the fin brazed joints in different joining directions with different topologies of fins commonly recommended in the literature. It is observed that the commonly recommended safe fin geometries are predicted to be susceptible to failure if a reduction in the brazed joint is considered. The analysis and recommendation in this paper shall provide a reliable and safe design approach for plate-fin exchangers for different operating conditions especially in low to cryogenic temperature applications.

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Influence of fins designs, geometries and conditions on the performance of a plate-fin heat exchanger-experimental perspective

Cited by 13 publications

References 18 publications

Investigation of the effect of different materials on convective heat transfer

Investigation of the effect of different materials on convective heat transfer

Effect of Spacing Between Baffles on the Dynamic and Thermal Behavior of Water in a Shell-and-Tube Heat Exchanger

Predicting the Structural Reliability of LNG Processing Plate-Fin Heat Exchanger for Energy Conservation

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