Evaluation of the Ratio of Heat Exchanging Tube Finning on Heat Exchanger Efficiency

Khizhov, Mihail; Mironova, Lubov

doi:10.1051/matecconf/202134603028

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…The fin discontinuity in front of the tube causes the smallest reduction in the heat transfer rate in comparison with the ideal tube-fin contact, especially for thin slits. In 2021, Khizhov et al [16] carried out thermal, hydraulic, and pneumatic tests on the tube bundle of the heat exchanger and presented full-size tube samples with different fin ratios. The formula for calculating the effect of fin ratio on heat exchanger efficiency was given.…”

Section: Introductionmentioning

confidence: 99%

Hydraulic Expansion Joint Contact State of Heat Exchanger Based on New Contact Area Measurement Method

Zhang,

Liu,

et al. 2023

Materials

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The contact state of a seamless internal threaded copper tube and an aluminium foil fin not only affects the heat transfer efficiency of a tube–fin heat exchanger but also seriously affects its service life. In this study, hydraulic expansion technology was used to connect the copper tube with an internal thread with a 7 mm diameter to the fin of the heat exchanger. The influence of the expansion pressure and pressure holding time on the contact state was analysed through experiments and finite element simulation, and the variation law of the two on the contact state was obtained. The contact state was characterised by the contact gap and contact area. In order to obtain the specific contact area value, a new method of measuring the contact area was developed to reveal the variation in contact area between the copper tube and the fin after expansion. The results show that the contact gap decreases with an increase in expansion pressure, while the pressure holding time remains the same. The contact area increases with an increase in expansion pressure, and the rate of increase slows. When the expansion pressure is 18 MPa, the average contact gap is approximately 0.018 mm. When the expansion pressure reaches 16 MPa, the contact area ratio is 91.0%. When the expansion pressure increases to 18 MPa, the contact area ratio only increases by approximately 0.6%. Compared with the influence of the expansion pressure on the increase in contact area, the influence of the pressure holding time on the contact area is lower.

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Section: Introductionmentioning

confidence: 99%

Hydraulic Expansion Joint Contact State of Heat Exchanger Based on New Contact Area Measurement Method

Zhang,

Liu,

et al. 2023

Materials

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“…The results showed that whether the surface of the heat exchange tube was magnetic or not had a significant effect on its fouling resistance. Lu et al [27] investigated particle deposition at different flow states. The results showed that for particles with small particle sizes (dp < 20 µm), the thermal network deposition led to a sharp increase in the particle deposition rate, but for particles with larger particle sizes (dp > 20 µm), it remained constant.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Turbulent Flow Structure and Particle Deposition in a Three-Dimensional Heat Transfer Duct with Convex Dimples

Han

et al. 2023

Coatings

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In engineering applications, dust deposition on the heat transfer channel greatly reduces the efficiency of heat transfer. Therefore, it is very significant to study the characteristics of particle deposition for thermal energy engineering applications. In this study, the Reynolds stress model (RSM) and the discrete phrase model (DPM) were used to simulate particle deposition in a 3D convex-dimpled rough channel. A discrete random walk model (DRW) was used for the turbulent diffusion of particles, and user-defined functions were developed for collisions between particles and walls. An improved deposition model of rebound between particles was developed. The flow structure, secondary flow, temperature distribution, Q criterion, and particle deposition distribution in the convex-dimpled rough channel were analyzed after a study of the grid independence and a numerical validation. The results showed that these mechanisms affected the flow structure in the flow field. For tiny particles (dp ≤ 10 μm), the presence of convex dimples promoted their deposition. The rates of particle deposition in the presence of convex dimples were 535, 768, 269, and 2 times higher than in smooth channels (particle sizes of 1, 3, 5, and 10 μm, respectively). However, for large particles (dp > 10 μm), although the presence of convex dimples had a certain effect on the location distribution of particle deposition, it had little effect on the deposition rates of large particles, which were 0.99, 0.98, 0.97 and 0.96 times those in the smooth channel, respectively.

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A CFD Study of Deposition Characteristics of Particles in Three-dimensional Heat Transfer Channel with Dimple-type Roughness Elements

Han

Lü

Zhang

et al. 2022

2022 4th International Conference on Smart Power &Amp; Internet Energy Systems (SPIES)

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Evaluation of the Ratio of Heat Exchanging Tube Finning on Heat Exchanger Efficiency

Cited by 3 publications

References 4 publications

Hydraulic Expansion Joint Contact State of Heat Exchanger Based on New Contact Area Measurement Method

Hydraulic Expansion Joint Contact State of Heat Exchanger Based on New Contact Area Measurement Method

Simulation of Turbulent Flow Structure and Particle Deposition in a Three-Dimensional Heat Transfer Duct with Convex Dimples

A CFD Study of Deposition Characteristics of Particles in Three-dimensional Heat Transfer Channel with Dimple-type Roughness Elements

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