Numerical Study of Thermal Enhancement in Modified Raccoon Microchannels

Tiwari, Nishant; Moharana, Manoj Kumar

doi:10.1615/heattransres.2018027061

Cited by 22 publications

(11 citation statements)

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“…The design and development of efficient heat exchanging systems (Kumar et al , 2016; Pati et al , 2020; Mehta and Pati, 2018, 2020a, 2020b, 2021a, 2021b; Sujith et al , 2021; Tiwari and Moharana, 2019a, 2019b, 2019c, Tiwari et al , 2017) is an important area of research because of its wide range of engineering applications such as solar collector, electro-chemical, geothermal processes and flow boiling (Evangelos et al , 2019; Fahim et al , 2016). In this context, researchers have commonly used two methods for heat transfer enhancement; namely, active and passive ones.…”

Section: Introductionmentioning

confidence: 99%

Analysis of thermo-hydraulic and entropy generation characteristics for flow through ribbed-wavy channel

Mehta

Pati

Ahmed

et al. 2021

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Purpose The purpose of this study is to analyze the thermal, hydraulic and entropy generation characteristics for laminar flow of water through a ribbed-wavy channel with the top wall as wavy and bottom wall as flat with ribs of three different geometries, namely, triangular, rectangular and semi-circular. Design/methodology/approach The finite element method-based numerical solver has been adopted to solve the governing transport equations. Findings A critical value of Reynolds number (Recri) is found beyond which, the average Nusselt number for the wavy or ribbed-wavy channel is more than that for a parallel plate channel and the value of Recri decreases with the increase in a number of ribs and for any given number of ribs, it is minimum for rectangular ribs. The performance factor (PF) sharply decreases with Reynolds number (Re) up to Re = 50 for all types of ribbed-wavy channels. For Re > 50, the change in PF with Re is gradual and decreases for all the ribbed cases and for the sinusoidal channel, it increases beyond Re = 100. The magnitude of PF strongly depends on the shape and number of ribs and Re. The relative magnitude of total entropy generation for different ribbed channels varies with Re and the number of ribs. Practical implications The findings of the present study are useful to design the economic heat exchanging devices. Originality/value The effects of shape and the number of ribs on the heat transfer performance and entropy generation have been investigated for the first time for the laminar flow regime. Also, the effects of shape and number of ribs on the flow and temperature fields and entropy generation have been investigated in detail.

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Section: Introductionmentioning

confidence: 99%

Analysis of thermo-hydraulic and entropy generation characteristics for flow through ribbed-wavy channel

Mehta

Pati

Ahmed

et al. 2021

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“…Tiwari and Moharana (2019b) numerically studied the thermo-hydraulic characteristics for conjugate heat transfer problem for flow through the wavy and raccoon wavy channel and reported that the raccoon channel has a better performance factor than the wavy channel. Tiwari and Moharana (2019c) numerically investigated the thermohydraulic characteristics for flow through a modified and simple raccoon microchannel in the laminar regime. The modified raccoon microchannel is designed by changing the combination of wavelength and amplitude at three different sections along the longitudinal direction.…”

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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“…The simulation models reliably predict such parameters may offer a considerable contribution to cost-saving, design and optimization efforts thanks to the reduction of the experimental test and cost. Therefore, many researchers have focused on the numerical investigation of heat transfer and fluid flow characteristics inside the microchannels [5][6][7][8]. Glazar et al [9] conducted an experimental and numerical analysis of heat transfer and fluid flow in the compact heat exchanger with different microchannel shapes.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental study on thermal characteristics of louvered fin microchannel air preheaters

Başaran

Yurddaş

2020

International Advanced Researches and Engineering Journal

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have been gradually getting importance in industrial applications due to offering outstanding benefits. The current study has focused on the development of a numerical model to predict the thermal performance of the microchannel air preheaters (MCPH) for HVAC systems. An experimental study has been performed to validate the numerical model results. A louvered fin multiport microchannel heat exchanger has been employed as an air preheater in the experiments. The proposed model has been developed based on the segment-bysegment approach and calculated the outlet temperature and heat capacity of the MCPH. Different air velocities at the frontal face and varying mass flow rates in passes of the MCPH have been taken into consideration in the model. It has been concluded from experimental data that the model predicts the outlet temperature with an average absolute deviation within ±2% for all investigated test conditions. The proposed model shows high accuracy with respect to temperature calculation. Another conclusion is that the non-uniform air velocity approach improves the precision of the proposed model. The heat capacity predictions with the uniform air velocity approach indicate higher deviations than the non-uniform air velocity approach. Microchannel heat exchanger Microchannel preheater Numerical modeling R600a Thermal characteristics

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Numerical Study of Thermal Enhancement in Modified Raccoon Microchannels

Cited by 22 publications

References 0 publications

Analysis of thermo-hydraulic and entropy generation characteristics for flow through ribbed-wavy channel

Analysis of thermo-hydraulic and entropy generation characteristics for flow through ribbed-wavy channel

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

Numerical and experimental study on thermal characteristics of louvered fin microchannel air preheaters

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