New design equations for turbulent forced convection heat transfer and pressure loss in pillow-plate channels

Piper, Mark; Zibart, Alexander; Kenig, Eugeny Y.

doi:10.1016/j.ijthermalsci.2017.06.012

Cited by 36 publications

(18 citation statements)

References 10 publications

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“…Constants B (Equation ( 19)) and C (Equation ( 20)) are functions of channel geometry, and can be calculated as a function of the aspect ratio (x = b/l), by polynomial functions Equations ( 19)- (23), developed by Dović and co-authors [22] based on the work of Shah [30]:…”

Section: Modelingmentioning

confidence: 99%

“…Then, Dović et al [22] introduced empirical correction factors to the classical Lévêque correlation for Nu calculation, counting for energy losses due to flow reversal at plate edges and flow path changing when entering the chevron angle. Piper et al [23] designed new equations for heat transfer and pressure drop, considering two zones in the flow pattern characteristic for pillow plates channels, with validity for 1000 ≤ Re ≤ 8000 and 1 ≤ Pr ≤ 150.…”

Section: Introductionmentioning

confidence: 99%

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Model Validation for the Heat Transfer in Gasket Plate Heat Exchangers Working with Vegetable Oils

Neagu

Koncsag

2022

Processes

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Many models for accurately predicting the performance of gasket plate heat exchangers were developed in the last decades, grouped in three categories: empirical, semi-analytical or theoretical/numerical, with the view to saving materials and energy through correct design of industrial equipment. This work addresses one such model, namely Lévêque correlation modified by Martin and by Dović, which is promising due to the correct assumption of the flow in sine duct channels and the consideration of energy losses caused by flow reversal at plate edges and the flow path changing when entering the chevron angle. This model was validated by our own experimental data under industrial conditions for vegetable oils processing, both in laminar flow (Re = 8–42) and fully developed turbulent flow (Re = 446–1137). Moreover, in this study, particular values for constants/parameters of the model were determined for the corrugation inclination angle relative to vertical direction equal to 30°. Through statistical analysis, this study demonstrates that this particularized form of the generalized Lévêque correlation can be used with confidence.

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Section: Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Model Validation for the Heat Transfer in Gasket Plate Heat Exchangers Working with Vegetable Oils

Neagu

Koncsag

2022

Processes

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“…Figure 2 and Table 1 show the specifications of the capsules. CPHEs A, B, and C have the same width (10 mm) and different lengths (20,15, and 25 mm, respectively), while CPHEs A, D, and E have the same length (20 mm) and different widths (10,5, and 15 mm, respectively).…”

Section: Geometrical Parametersmentioning

confidence: 99%

“…Compared with a traditional chevron-type plate heat exchanger, the resistance to flow of the new plate heat exchanger decreased by more than 50% and heat transfer decreased by 25%. Piper and colleagues [9][10][11] investigated the influence of the pillow-plate geometry on thermo-hydraulic performance and derived new design equations for predicting the flow and heat transfer performances of pillow-plate heat exchangers. Li et al 12 experimentally studied the flow and heat transfer of discrete rib plate heat exchangers, where the inclined discrete ribs are similar to capsules.…”

Section: Introductionmentioning

confidence: 99%

Influence of capsule length and width on heat transfer in capsule-type plate heat exchangers

Jiang

Zhou²,

Tang

et al. 2019

Advances in Mechanical Engineering

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Capsule-type plate heat exchanger has the advantages of less deposition and low flow resistance. Based on previous research, numerical studies of capsule-type plate heat exchangers with different capsule lengths and widths for the Reynolds number ranging from 600 to 10,000 are performed. The results show that wake vortices, transverse vortices, and longitudinal vortices generate in the channels by the flow shearing and separation. The vortices promote the swirl and flow destabilization, exchange the fluid between the boundary layer and the mainstream, and thus enhance the heat transfer in the capsule-type plate channels. Wake vortices transform to longitudinal vortices with increasing Re. The number of the longitudinal vortices decreases and the size of the longitudinal vortices increases with increasing Re or the decreasing length−width ratio of the capsule. In addition, Nusselt number and friction factor decrease with the increasing length−width ratio of the capsule.

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“…However, along with several advantages, there is a certain limitation, which is connected with the need to corrugate heat exchange plates [5,6]. This is necessary to minimize deposits on plate surfaces and to create local flow turbulizations, which increase heat transfer coefficients [7][8][9][10][11]. The intensity of heat transfer directly depends on the geometry of the corrugation on the surface of the plates.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Heat Exchange Plate Geometry by Modeling Physical Processes Using CAD

et al. 2022

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This article presents the possibility of evaluating the efficiency of the heat exchange element with a special stamping plate, which is based on the results of computer simulation. The method is based on a comparative analysis of convective heat transfer models implemented in ANSYS using a k-ε turbulence model. To conduct the study, 3D models of three different types of cavity geometry formed between two heat exchange plates (flat plate, chevron plate, and plate with conical stampings) were built. Simulation was performed by finite element analysis in ANSYS for channels formed by the three types of plates, one of which is a new configuration. The results of hydrodynamic and heat exchange parameters allowed for establishing the efficiency of convective heat exchange for plates of known structures and to compare them with the proposed one. It was found that the plates with conical stamping form the smallest channels through which the fluid moves. The velocity of the coolant is uniform throughout the cross section of the channel and equal to 0.294 m/s; the value of the heat transfer coefficient is the largest of the three models and is 5339 W/(m K), while the pressure drop is 1060 Pa. Taking into account the simulation results, the best heat transfer parameters were shown by the channel formed by plates with conical stamping and the highest pressure drop. To increase the efficiency, indicated by the ratio of heat transfer coefficients to hydraulic resistance, the geometry of the plate with conical stamping was optimized. As a result of optimization, it was found that the optimal geometric parameters of the heat exchange plate with conical stamping were achieved at a 55° inclination angle and 1.5 mm height for the cone. The results of this study can be used in the design of heat exchange elements of new structures with optimal parameters for highly efficient heating of liquid coolants.

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New design equations for turbulent forced convection heat transfer and pressure loss in pillow-plate channels

Cited by 36 publications

References 10 publications

Model Validation for the Heat Transfer in Gasket Plate Heat Exchangers Working with Vegetable Oils

Model Validation for the Heat Transfer in Gasket Plate Heat Exchangers Working with Vegetable Oils

Influence of capsule length and width on heat transfer in capsule-type plate heat exchangers

Optimization of Heat Exchange Plate Geometry by Modeling Physical Processes Using CAD

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