Numerical study of thermo-hydraulic characteristics for forced convective flow through wavy channel at different Prandtl numbers

Mehta, Sumit Kumar; Pati, Sukumar

doi:10.1007/s10973-020-09412-5

Cited by 45 publications

(44 citation statements)

References 58 publications

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“…It is a well-known fact that performance of the solar collector is significantly influenced by the radiation heat transfer [19]. However, in most of the previous studies, radiative heat transfer taking place between the absorber plate and glass cover was neglected for simplification of analysis [33,34]. In the present study, together with convection and conduction, radiation heat transfer was also taken into consideration while modeling FPSC and SLSC.…”

Section: Boundary Conditionsmentioning

confidence: 96%

“…The repeated heat transfer element in the form of semicircular wire loops is expected to act as the artificial roughness near to absorber plate and turbulators across the collector cross section. Moreover, it was seen in literature that during the simulation of flat plate solar collector, an essential heat transfer parameter, i.e., radiative heat transfer, is often ignored and studies are limited to 1D and 2D analysis [31][32][33][34]. In the present analysis, more reliable and realistic 3D numerical models considering the radiative, convective and conductive heat transfer inside the flat plate solar collector were developed and model predicted results were validated with experiments.…”

Section: Introductionmentioning

confidence: 94%

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Heat transfer augmentation of flat plate solar collector through finite element-based parametric study

Rani

Tripathy

2020

J Therm Anal Calorim

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The introduction of fins and baffles on the absorber plate is an effective way to ameliorate the thermal performance of flat plate solar collector (FPSC), but obstructs the air passage leading to considerable pumping power penalty. In the current work, attempt is made to improve the overall performance of collector with the incorporation of hollow semicircular loop fins and rectangular baffles over the absorber plate for air mass flow rate ranging from 0.006 to 0.02 kg s −1 . A parametric study was carried out with finite element approach considering different radius (2-4 cm), pitch (6-20 cm) and number of semicircular loops per row in transverse direction (3-8 loops). Compared to intermittent loops, placement of continuous staggered semicircular loops was more effective for attaining uniform profile and higher magnitude of air temperature at collector outlet. With regard to FPSC, finned collector provided 2.64-2.95 times greater Nusselt number and 41-75% higher thermal efficiency, as well as exhibited 8.38-10.4 K higher collector outlet average air temperature. The pressure drop noted for FPSC was 0.14 Pa and increased to the range of 0.5-0.7 Pa with the addition of loops and baffles at an air mass flow rate of 0.01 kg s −1 . Collector having baffles and continuous semicircular loops of radius 3 cm, made up of 2-mm-thick wire, presented maximum thermohydraulic performance factor of 1.73 in conjunction with showing maximum magnitude and uniform profile of collector outlet temperature. The modified collector with semicircular loops along with baffles will find its application in efficient drying of agricultural commodities.

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Section: Boundary Conditionsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 94%

Heat transfer augmentation of flat plate solar collector through finite element-based parametric study

Rani

Tripathy

2020

J Therm Anal Calorim

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“…Mehta and Pati [21] did a numerical study for a wavy channel at different Prandtl numbers. Reynolds number, Prandtl number, and geometrical configuration of the channel strongly influenced the local thermal entropy generation distribution.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of the impact of inclined baffles and an elastic vibrating beam on the thermo-fluid behavior in a rectangular channel

2021

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In the present work, the influence of inclined baffles and an elastic vibrating beam is investigated on the flow pattern and heat transfer rate in a rectangular channel. The cylinder with the elastic vibrating beam develops the vibrating flow. The computations are based on the finite element method (FEM); Galerkin least-squares scheme and Newton–Raphson iterative method are implemented to solve the governing equations. The fluid structure-interaction (FSI) method is used to analyze the elastic vibrating beam. The friction factor coefficient and Nusselt number are examined for the inclined and conventional baffles. The flow regime is assumed to be laminar for various baffle angles and Reynolds numbers. The vibrating beam is connected to the cylinder located in the channel entrance. Optimized cases with the maximum heat transfer and minimum friction factor are introduced. The novelty of this study is the simultaneous use of the elastic vibrating beam and inclined baffles in a rectangular channel. The results show that mounting an elastic vibrating beam on the cylinder leads the heat transfer rate to increase. The channel with an elastic vibrating beam and inclined baffles at 135° is the optimized case compared to other cases.Article Highlights Take advantage of using an elastic vibrating beam in a rectangular channel. Influences of inclined baffles on thermal performance are examined numerically. The optimum case for the channel with inclined-baffles is reported.

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“…The modified raccoon microchannel is designed by changing the combination of wavelength and amplitude at three different sections along the longitudinal direction. Several works have been reported on the passive method of heat transfer enhancement by considering the different profile of walls such as sinusoidal (Harikrishnan and Tiwari, 2018;Mehta and Pati, 2018;Mehta and Pati, 2020;Tiwari et al, 2017), triangular (Akbarzadeh et al, 2017;Mehta and Pati, 2019), trapezoidal (Akbarzadeh et al, 2017) and ribbed (Gao et al, 2019;Zheng et al, 2020). These studies are focused on analyzing the effects of geometrical and flow parameters on the characteristics of heat transfer and pressure drop.…”

Section: Introductionmentioning

confidence: 99%

“…Mehta and Pati (2019) analyzed the entropy generation characteristics for flow through a triangular corrugated channel by varying the amplitude and wavelength in the laminar regime and identified a critical Re for which the total entropy generation is maximum. Mehta and Pati (2020) studied the entropy generation for flow through a sinusoidal wavy channel in the laminar regime for a wide range of Re and Prandtl number (Pr) as follows: 25 # Re # 200 and 0:72 # Pr # 100.…”

Section: Introductionmentioning

confidence: 99%

Thermo-hydraulic and entropy generation analysis for magnetohydrodynamic pressure driven flow of nanofluid through an asymmetric wavy channel

Mehta

Pati

2020

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Purpose The purpose of this paper is to analyze the thermal, hydraulic and entropy generation characteristics for the magneto-hydrodynamic (MHD) pressure-driven flow of Al2O3-water nanofluid through an asymmetric wavy channel. Design/methodology/approach Galerkin finite element method is used to solve the governing transport equations numerically within the computational domain using the appropriate boundary conditions. The temperature and flow fields are computed by varying Reynolds number (Re), Hartmann number (Ha) and nano-particle volume fraction (ϕ) in the following range: 10 ≤ Re ≤ 500, 0 ≤ Ha ≤ 75 and 0 ≤ ϕ ≤ 5%. Findings The formation of the recirculation zones in the wavy passages, the size of it and the strength of the vortices formed can be modulated by the application of the magnetic field. The overall heat transfer rate increases with Ha for all ϕ both for a lower and higher regime of Re although the enhancement is more for lower values of Re and nanofluids as compared to base fluid and for intermediate values of Re, the effect of a magnetic field is almost insignificant. The magnetic performance factor (PFmagnetic) decreases with Ha although the rate of decrement varies with Re. The increase ϕ also enhances PFmagnetic especially at lower and higher values of Re. The addition of nano-particle enhances the entropy generation at lower values of the Re, while the opposite effect is seen for higher values of Re. Practical implications The present study has enormous practical relevance for the design of heat exchanger applied for solar collectors, process plants, textile and aerospace applications. Originality/value The combined effects on the heat transfer rate and the associated pressure drop penalty due to the applied magnetic field for the flow of nanofluid through an asymmetric wavy channel have not been reported to date. The effect of the magnetic field on the formation of recirculation zones and hot spot intensity in the asymmetric wavy channel has been examined in detail. The PFmagnetic is investigated first time for the MHD nanofluid flow through a wavy channel.

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Numerical study of thermo-hydraulic characteristics for forced convective flow through wavy channel at different Prandtl numbers

Cited by 45 publications

References 58 publications

Heat transfer augmentation of flat plate solar collector through finite element-based parametric study

Heat transfer augmentation of flat plate solar collector through finite element-based parametric study

Numerical investigation of the impact of inclined baffles and an elastic vibrating beam on the thermo-fluid behavior in a rectangular channel

Thermo-hydraulic and entropy generation analysis for magnetohydrodynamic pressure driven flow of nanofluid through an asymmetric wavy channel

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