Velocity profiles between two baffles in a shell and tube heat exchanger

Chang, Tae-Hyun; Lee, Chang-Hoan; Lee, Hae-Soo; Lee, Kwon-Soo

doi:10.1007/s11630-015-0795-x

Cited by 7 publications

(5 citation statements)

References 13 publications

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“…The fin surfaces are secondary heat transfer surfaces, and are considered as thermal coupling boundaries. Gravity is not considered in the simulation 26 , 27 . The fin material is aluminum, the fluid is air, and the physical properties are shown in Table 3 .…”

Section: Modeling Methodologymentioning

confidence: 99%

Heat transfer and pressure drop characteristic research of sine wavy flying-wing fins

Miao,

Wan,

et al. 2023

Sci Rep

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In recent years, heat transfer enhancement of heat exchange equipment has attracted more and more attention. In this paper, the heat transfer and pressure drop characteristics of sine wavy flying-wing fins are studied by numerical method. The objective is to improve the integrated heat transfer and pressure drop performance of sine wavy flying-wing fins. The degrees of freedom of fin sizes include fin pitch to fin height ratio fp/fh, fin height to fin wavelength ratio fh/W, fin amplitude to fin pitch ratio 2A/fp and fin inclined angle α. The results show that among the calculated 17 flying-wing fins, the optimal values of fp/fh, fh/W, 2A/fp, and α are 0.5, 0.4, 1.9 and 70° respectively. The optimized SWFWF simulation model is established, and the average JF factor is 1.307, which is about 10.9% higher than that of Fin 05 (JF = 1.18). Multiple linear regression is used to obtain the correlations of flow and heat transfer characteristics of flying-wing fins. The average deviation of the correlations for j and f are 0.85% and 4.9% respectively. The correlations can be used for the design and optimization of sine wavy flying-wing fins.

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Section: Modeling Methodologymentioning

confidence: 99%

Heat transfer and pressure drop characteristic research of sine wavy flying-wing fins

Miao,

Wan,

et al. 2023

Sci Rep

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“…The effect of segmented baffles on the STHE performance was analyzed by Chang et al in [26]. Tests were performed by application of a heat exchanger with two baffles located along a tube bundle.…”

Section: Insights From the Literature In The Field Of Piv Application In Heat Exchangersmentioning

confidence: 99%

CFD and PIV Investigation of a Liquid Flow Maldistribution across a Tube Bundle in the Shell-and-Tube Heat Exchanger with Segmental Baffles

et al. 2020

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The paper presents the results of research on liquid flow maldistribution in the shell side of a shell-and-tube heat exchanger (STHE). This phenomenon constitutes the reason for the formation of the velocity reduction area and adversely affects heat transfer and pressure drop. In order to provide details of the liquid distribution in STHE, two visualization methods were utilized. First, computational fluid dynamics (CFD) code coupled with the k-ε model and the laser-based particle image velocimetry (PIV) technique was applied. The tests were carried out for a bundle comprising 37 tubes in an in-line layout with a pitch dz/t = 1.5, placed in a shell with Din = 0.1 m. The STHE liquid feed rates corresponded to Reynolds numbers Rein equal to 16,662, 24,993, and 33,324. The analysis demonstrated that the flow maldistribution in the investigated geometry originates the result of three main streams in the cross-section of the shell side: central stream, oblique stream, and bypass stream. For central and oblique streams, the largest velocity reduction areas were formed in the wake of the tubes. On the basis of the flow visualization, it was also shown that the in-line layout of the tube bundle helps to boost the wake region between successive tubes in a row. Additionally, unfavorable vortex phenomena between the last row of tubes and the lower part of the exchanger shell were identified in the investigations. The conducted studies confirmed the feasibility of both methods in the identification and assessment of fluid flow irregularities in STHE. The maximum error of the CFD method in comparison to the experimental methods did not exceed 7% in terms of the pressure drops and 11% in the range of the maximum velocities.

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“…The problems associated with shell and tube heat exchanger applications are mostly the considerable pressure drop as a result of the disturbance from the flow through the shell side area [6,7]. This significantly affects the cost of the heat exchangers and the presence of the multiple rows of tubes and baffles in the shell side that leads to further interference in the velocity of the liquid in the shell side region [8,9]. The differences in the intensity of local flow velocities also lead to the occurrence of the major heat transfer coefficients for a particular tube row.…”

Section: Introductionmentioning

confidence: 99%

Design, Fabrication and Performance Evaluation of a Shell and Tube Heat Exchanger for Practical Application

Abdulmumuni

Ayoade

Buhari

et al. 2020

EJERS

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A heat exchanger is a device used to transfer thermal energy between two or more fluids, at different temperatures in thermal contact. This paper focuses on a shell-and-tubes heat exchanger that involves two fluids (hot water and cold water) in contact with each other while the cold water flows through the tubes and hot water through the shell. Heat exchangers have special and practical applications in the feed water cooler in the process industries, power plants, chemical plants, refineries, process applications as well as refrigeration and air conditioning industry. The design calculations were carried out to determine the specifications of essential parameters for the development of the heat exchanger, data generated from the theoretical formulae were used to fabricate the heat exchanger using some locally available and durable materials, and the performance of the system was evaluated. Some of the parameters evaluated include heat duty, capacity ratio, effectiveness, overall heat transfer coefficient, and fouling factor. The heat exchanger was tested under various flow conditions and the results obtained were as follows; cold water inlet temperatures of (26, 26, 26, 27and 27) ºC increased to (59, 44, 39, 47 and 35) ºC after (10, 7½, 6½ 8, and 6) minutes and the hot water temperatures decreased from (100, 80, 75, 87 and 73) ºC to (73, 59, 55, 62 and 50) ºC, respectively. The design data and test data were compared in terms of the heat duty, capacity ratio, effectiveness, overall heat transfer coefficient, and fouling factor, the deviation is found to be 22.87%, 13.99%, 8.98%, 43.30%, and 43.30% respectively. The results obtained proved that the heat exchanger was effective, reliable and provides a good technical approach to evaluate the thermal performance of the heat exchanger and useful in conducting heat and mass transfer practical in thermodynamics laboratory.

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Velocity profiles between two baffles in a shell and tube heat exchanger

Cited by 7 publications

References 13 publications

Heat transfer and pressure drop characteristic research of sine wavy flying-wing fins

Heat transfer and pressure drop characteristic research of sine wavy flying-wing fins

CFD and PIV Investigation of a Liquid Flow Maldistribution across a Tube Bundle in the Shell-and-Tube Heat Exchanger with Segmental Baffles

Design, Fabrication and Performance Evaluation of a Shell and Tube Heat Exchanger for Practical Application

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