Effects of Shear Dependent Viscosity and Variable Thermal Conductivity on the Flow and Heat Transfer in a Slurry

Miao, Ling; Massoudi, Mehrdad

doi:10.3390/en81011546

Cited by 15 publications

(8 citation statements)

References 74 publications

(90 reference statements)

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“…In the end, besides what we discussed in this paper, there are still many remaining issues we will investigate in the following work. Such as the effect degree of casing program on the heat transfer procedures during drilling horizontal wells, the thermal behaviors under a three-dimensional well trajectory, the variations of drilling fluid properties resulting from temperature changes, and the varying trends of heat transfer when the composition of drilling fluid is changed (the influx of formation fluids, the increase of cuttings concentration) should also be considered [15,[67][68][69]. If the grid number along the radial direction is i MAX , and that along the depth direction was j MAX , the sequence of all items in the discretized equations was rearranged according to Equation (A5).…”

Section: Discussionmentioning

confidence: 99%

Heat Transfer Behaviors in Horizontal Wells Considering the Effects of Drill Pipe Rotation, and Hydraulic and Mechanical Frictions during Drilling Procedures

et al. 2018

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Horizontal wells are increasingly being utilized in the exploration and development of oil and gas resources. However, the high temperature that occurs during drilling processes leads to a number of problems, such as the deterioration of drilling fluid properties and borehole instability. Therefore, the insight into heat transfer behaviors in horizontal wells is certainly advantageous. This study presents an integrated numerical model for predicting the temperature distribution during horizontal wells drilling considering the effects of drill pipe rotations, and hydraulic (i.e., circulating pressure losses) and mechanical frictions. A full implicit finite difference method was applied to solve this model. The results revealed that the mechanical frictions affect more on wellbore temperature variation than the effects of heat transfer intensification and circulating pressure losses; Moreover, the drilling fluid temperature was found higher than the stratum temperature at horizontal section, the temperature difference at the bottom hole reached up to 16 °C if pressure drops, heat transfer strengthened by rotations and mechanical frictions were all taken into account. This research could be utilized as a theoretical reference for predicting temperature distributions and estimating risks in horizontal wells drilling.

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Section: Discussionmentioning

confidence: 99%

Heat Transfer Behaviors in Horizontal Wells Considering the Effects of Drill Pipe Rotation, and Hydraulic and Mechanical Frictions during Drilling Procedures

et al. 2018

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“…This issue, as important as it is, is beyond the scope of our study. However, a recent study by Miao and Massoudi [81], where a simplified version of Equation (4.26) was used to study the heat transfer to a slurry, indicates that indeed the non-linear terms in the heat flux vector, which also appear in the expression for the thermal conductivity, significantly influence the heat transfer characteristic of the fluid. The discussion of the constitutive modeling of the heat flux vector for slag is from a theoretical perspective.…”

Section: Discussionmentioning

confidence: 99%

On the Heat Flux Vector and Thermal Conductivity of Slags: A Brief Review

2016

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Abstract:The viscosity and the thermal conductivity of slag are among two of the most important material properties that need to be studied. In this paper we review the existing theoretical and experimental correlations for the thermal conductivity of slag. However, since, in general, slag behaves as a non-linear fluid, it is the heat flux vector which must be studied. Both explicit and implicit approaches are discussed and suggestions about the form of the heat flux vector and the thermal conductivity and their dependence on shear rate, porosity, deformation, etc. are provided. The discussion of the constitutive modeling of the heat flux vector for slag is from a theoretical perspective.

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“…In general, the thermal conductivity of nanofluids (suspension with particles) is not constant; it can be a function of temperature, shear rate, concentration, etc. [29][30][31]. For a recent review of the heat flux vector, see [32][33][34].…”

Section: Constitutive Equationsmentioning

confidence: 99%

Thermal Performance in Convection Flow of Nanofluids Using a Deep Convolutional Neural Network

et al. 2022

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This study develops a geometry adaptive, physical field predictor for the combined forced and natural convection flow of a nanofluid in horizontal single or double-inner cylinder annular pipes with various inner cylinder sizes and placements based on deep learning. The predictor is built with a convolutional-deconvolutional structure, where the input is the annulus cross-section geometry and the output is the temperature and the Nusselt number for the nanofluid-filled annulus. Profiting from the proven ability of dealing with pixel-like data, the convolutional neural network (CNN)-based predictor enables an accurate end-to-end mapping from the geometry input and the desired nanofluid physical field. Taking the computational fluid dynamics (CFD) calculation as the basis of our approach, the obtained results show that the average accuracy of the predicted temperature field and the coefficient of determination R2 are more than 99.9% and 0.998 accurate for single-inner cylinder nanofluid-filled annulus; while for the more complex case of double-inner cylinder, the results are still very close, higher than 99.8% and 0.99, respectively. Furthermore, the predictor takes only 0.038 s for each nanofluid field prediction, four orders of magnitude faster than the numerical simulation. The high accuracy and the fast speed estimation of the proposed predictor show the great potential of this approach to perform efficient inner cylinder configuration design and optimization for nanofluid-filled annulus.

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Effects of Shear Dependent Viscosity and Variable Thermal Conductivity on the Flow and Heat Transfer in a Slurry

Cited by 15 publications

References 74 publications

Heat Transfer Behaviors in Horizontal Wells Considering the Effects of Drill Pipe Rotation, and Hydraulic and Mechanical Frictions during Drilling Procedures

Heat Transfer Behaviors in Horizontal Wells Considering the Effects of Drill Pipe Rotation, and Hydraulic and Mechanical Frictions during Drilling Procedures

On the Heat Flux Vector and Thermal Conductivity of Slags: A Brief Review

Thermal Performance in Convection Flow of Nanofluids Using a Deep Convolutional Neural Network

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