Effect of Pore to Throat Size Ratio on Interfacial Heat Transfer Coefficient of Porous Media

Özgümüş, Türküler; Mobedi, Moghtada

doi:10.1115/1.4028764

Cited by 13 publications

(15 citation statements)

References 21 publications

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“…A good agreement between the present results and those reported studies can be observed. The results of the present study are also validated by comparing with the relationship suggested in the study of Ozgumus and Mobedi (2015) as shown in Figure 3(c). The correlation in their study was given for forced convection heat transfer when Re changes between 1 and 100.…”

Section: Validation Of Obtained Numerical Resultssupporting

confidence: 79%

“…For instance, Kuwahara et al (2001) numerically studied the interfacial convective heat transfer coefficient for forced convection in a periodic porous medium consisting of square rods with staggered arrangement under local thermal non-equilibrium. Similar studies for the effect of different parameters were performed by Nakayama et al (2002), Ozgumus and Mobedi (2015), Petrasch et al (2008), Saito and de Lemos (2005), Teruel and Díaz (2013) and Gamrat et al (2008). Furthermore, Rees (2010) performed microscopic study on a composite solid saturated with a single fluid to calculate values for the interface heat transfer coefficient; however, the effect of fluid flow was not considered.…”

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confidence: 88%

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A pore scale analysis for determination of interfacial convective heat transfer coefficient for thin periodic porous media under mixed convection

Çelik

Mobedi

Manca

et al. 2017

Int Jnl of Num Meth for HFF

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Purpose -The purpose of this study is to determine interfacial convective heat transfer coefficient numerically, for a porous media consisting of square blocks in inline arrangement under mixed convection heat transfer.Design/methodology/approach -The continuity, momentum and energy equations are solved in dimensionless form for a representative elementary volume of porous media, numerically. The velocity and temperature fields for different values of porosity, Ri and Re numbers are obtained. The study is performed for the range of Ri number from 0.01 to 10, Re number from 100 to 500 and porosity value from 0.51 to 0.96. Based on the obtained results, the value of the interfacial convective heat transfer coefficient is calculated by using volume average method.Findings -It was found that at low porosities (such as 0.51), the interfacial Nusselt number does not considerably change with Ri and Re numbers. However, for porous media with high Ri number and porosity (such as 10 and 0.51, respectively), secondary flows occur in the middle of the channel between rods improving heat transfer between solid and fluid, considerably. It is shown that the available correlations of interfacial heat transfer coefficient suggested for forced convection can be used for mixed convection for the porous media with low porosity (such as 0.51) or for the flow with low Ri number (such as 0.01).Originality/value -To the best of the authors' knowledge, there is no study on determination of interfacial convective heat transfer coefficient for mixed convection in porous media in literature. The present study might be the first study providing an accurate idea on the range of this important parameter, which will be useful particularly for researchers who study on mixed convection heat transfer in porous media, macroscopically.

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Section: Validation Of Obtained Numerical Resultssupporting

confidence: 79%

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confidence: 88%

A pore scale analysis for determination of interfacial convective heat transfer coefficient for thin periodic porous media under mixed convection

Çelik

Mobedi

Manca

et al. 2017

Int Jnl of Num Meth for HFF

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“…H) is selected as characteristic length to define Nusselt number. The same behavior is also observed in numerous other reported studies (Kuwahara et al, 2000, Ozgumus andMobedi, 2014). Furthermore, to compare the Nusselt number of dual scale with mono-scaled porosity, equation 19is modified.…”

Section: Governing Equations and Boundary Conditions For Determinatiosupporting

confidence: 79%

“…The porous media with square rods in in-line arrangement and porosity of 0.75 is created. After solving the equations, the interfacial Nusselt numbers found for this porous media are compared with the results of Ozgumus and Mobedi (2014), Kuwahara et al (2000), Penha et al (2011) and Gamrat et al (2008) and the comparison is shown in Figure 5. As demonstrated in Figure 5, there is an excellent agreement between the results of the present study and the literature results for an extensive variety of Reynolds number.…”

Section: Resultsmentioning

confidence: 99%

Numerical determination of interfacial heat transfer coefficient for an aligned dual scale porous medium

Sabet

Mobedi

Barışık

et al. 2018

HFF

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Purpose Fluid flow and heat transfer in a dual scale porous media is investigated to determine the interfacial convective heat transfer coefficient, numerically. The studied porous media is a periodic dual scale porous media. It consists of the square rods which are permeable in an aligned arrangement. It is aimed to observe the enhancement of heat transfer through the porous media, which is important for thermal designers, by inserting intra-pores into the square rods. A special attention is given to the roles of size and number of intra-pores on the heat transfer enhancement through the dual scale porous media. The role of intra-pores on the pressure drop of air flow through porous media is also investigated by calculation and comparison of the friction coefficient. Design/methodology/approach To calculate the interfacial convective heat transfer coefficient, the governing equations which are continuity, momentum and energy equations are solved to determine velocity, pressure and temperature fields. As the dual scale porous structure is periodic, a representative elementary volume is generated, and the governing equations are numerically solved for the selected representative volume. By using the obtained velocity, pressure and temperature fields and using volume average definition, the volume average of aforementioned parameters is calculated and upscaled. Then, the interfacial convective heat transfer coefficient and the friction coefficient is numerically determined. The interparticle porosity is changed between 0.4 and 0.75, while the intraparticle varies between 0.2 and 0.75 to explore the effect of intra-pore on heat transfer enhancement. Findings The obtained Nusselt number values are compared with corresponding mono-scale porous media, and it is found that heat transfer through a porous medium can be enhanced threefold (without the increase of pressure drop) by inserting intraparticle pores in flow direction. For the porous media with low values of interparticle porosity (i.e. = 0.4), an optimum intraparticle porosity exists for which the highest heat transfer enhancement can be achieved. This value was found around 0.3 when the interparticle porosity was 0.4. Research limitations/implications The results of the study are interesting, especially from heat transfer enhancement point of view. However, further studies are required. For instance, studies should be performed to analyze the rate of the heat transfer enhancement for different shapes and arrangements of particles and a wider range of porosity. The other important parameter influencing heat transfer enhancement is the direction of pores. In the present study, the intraparticle pores are in flow direction; hence, the enhancement rate of heat transfer for different directions of pores must also be investigated. Practical implications The application of dual scale porous media is widely faced in daily life, nature and industry. The flowing of a fluid through a fiber mat, woven fiber bundles, multifilament textile fibers, oil filters and fractured porous media are some examples for the application of the heat and fluid flow through a dual scale porous media. Heat transfer enhancement. Social implications The enhancement of heat transfer is a significant topic that gained the attention of researchers in recent years. The importance of topic increases day-by-day because of further demands for downsizing of thermal equipment and heat recovery devices. The aim of thermal designers is to enhance heat transfer rate in thermal devices and to reduce their volume (and/or weight in some applications) by using lower mechanical power for cooling. Originality/value The present study might be the first study on determination of thermal transport properties of dual scale porous media yielded interesting results such as considerable enhancement of heat transfer by using proper intraparticle channels in a porous medium.

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“…This pattern is clearly visible in numerical investigations that were conducted using a pore-scale approach (e.g., Refs. [16][17][18]) and especially in those studies that took a macroscopic modeling approach (e.g., Refs. [19][20][21][22]).…”

Section: Introductionmentioning

confidence: 99%

A Pore-Scale Investigation of the Transient Response of Forced Convection in Porous Media to Inlet Ramp Inputs

Habib

Yadollahi

Karimi

2020

Journal of Energy Resources Technology

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This paper investigates the transient response of forced convection of heat in a reticulated porous medium through taking a pore-scale approach. The thermal system is subject to a ramp disturbance superimposed on the entrance flow temperature/velocity. The developed model consisted of ten cylindrical obstacles aligned in a staggered arrangement with set isothermal boundary conditions. A few types of fluids, along with different values of porosity and Reynolds number are considered. Assuming a laminar flow, the unsteady Navier Stokes and energy equations are solved numerically. The temporally developing flow and temperature fields as well as the surface averaged Nusselt numbers are used to explore the transient response of the system. Further, a Response Lag Ratio (RLR) is defined to compare the transient response and the input. The results reveal that an increase in amplitude increases the RLR. Nonetheless, an increase in ramp duration decreases the RLR, particularly for high density fluids. Interestingly, it is found that Reynolds number has almost negligible effects upon RLP. This study clearly reflects the importance of conducting pore-scale analyses for understanding the transient response of heat convection in porous media.

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Effect of Pore to Throat Size Ratio on Interfacial Heat Transfer Coefficient of Porous Media

Cited by 13 publications

References 21 publications

A pore scale analysis for determination of interfacial convective heat transfer coefficient for thin periodic porous media under mixed convection

A pore scale analysis for determination of interfacial convective heat transfer coefficient for thin periodic porous media under mixed convection

Numerical determination of interfacial heat transfer coefficient for an aligned dual scale porous medium

A Pore-Scale Investigation of the Transient Response of Forced Convection in Porous Media to Inlet Ramp Inputs

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