International Journal of Thermofluids最新文献_第2页

Numerical simulation of chemically reacted hybrid nanofluid Forchheimer flow across a porous cone/wedge with radiation absorption 具有辐射吸收的多孔锥/楔体中化学反应混合纳米流体Forchheimer流动的数值模拟

Q1 Chemical Engineering

International Journal of Thermofluids

Pub Date : 2026-01-14 DOI: 10.1016/j.ijft.2026.101558

Chundru Maheswari , Bhavanam Naga Lakshmi , Ravuri Mohana Ramana , Samad Noeiaghdam , Unai Fernandez-Gamiz

The present study provides a numerical exploration of steady, laminar, two-dimensional Forchheimer flow involving a chemically reacted Al₂O₃–Cu/H₂O hybrid nanofluid over vertically oriented porous wedge and cone geometries with non-isothermal and non-isosolutal constraints, incorporating the influence of radiation absorption and the thermal Grashof number. The set of non-linear ODEs is derived from the set of non-linear PDEs by employing similarity transformations. Numerical solutions are obtained using the bvp5c method implemented in MATLAB. The influence of key parameters on the flowing fields, along with heat and mass transmission rates, is analysed and presented through graphical and tabular formats. The results indicate that the velocity profile rises with an increase in the thermal Grashof number, whereas it declines with greater values of the Forchheimer number and porosity parameter. The temperature profile shows an upward tendency with increasing Forchheimer number, porosity and radiation absorption, while it decreases as thermal Grashof number intensifies. The concentration decreases with higher thermal Grashof number and chemical reaction, but increases with greater Forchheimer number. These effects are more pronounced in the wedge configuration than in the cone. Furthermore, the heat and mass transmission rates influenced by the key parameters are systematically summarized in tables. The analysis illustrates the skin friction coefficient increases by 24% and 34% as the thermal Grashof number rises from 1 to 4, and decreases by 12% and 16% with increasing Forchheimer number and porosity parameter (0.1 to 1) in the cone and wedge respectively. The Nusselt number decreases by 74% for the cone and 8% for the wedge as radiation absorption increases from 1 to 1.3, while the Sherwood number increases by 10% and 11% as the chemical reaction parameter rises from 0.5 to 0.8 in the cone and wedge respectively. The accuracy of the proposed model has been thoroughly validated against existing literature, showing strong consistency with earlier findings.

在非等温和非等溶质约束下，考虑辐射吸收和热格拉希夫数的影响，对Al2O3-Cu /H2O混合纳米流体在垂直取向多孔楔形和锥形几何结构上的稳定、层流和二维Forchheimer流动进行了数值研究。在非线性偏微分方程的基础上，通过相似变换得到非线性偏微分方程的集合。利用MATLAB实现的bvp5c方法得到了数值解。通过图形和表格的形式分析了关键参数对流场以及传热传质率的影响。结果表明：速度剖面随热格拉什夫数的增大而增大，随福希海默数和孔隙度参数的增大而减小；温度分布随Forchheimer数、孔隙度和辐射吸收量的增加呈上升趋势，随热Grashof数的增加呈下降趋势。浓度随热格拉什夫数和化学反应的增加而降低，随福希海默数的增加而增加。这些影响在楔形结构中比在锥形结构中更为明显。此外，系统地总结了受关键参数影响的传热传质率。分析表明，当热Grashof数从1增加到4时，表面摩擦系数分别增加24%和34%，而当锥体和楔体的Forchheimer数和孔隙度参数（0.1 to 1）增加时，表面摩擦系数分别降低12%和16%。当辐射吸收从1增加到1.3时，锥体的Nusselt数减少了74%，楔体的Nusselt数减少了8%，而当化学反应参数从0.5增加到0.8时，锥体和楔体的Sherwood数分别增加了10%和11%。所提出的模型的准确性已与现有文献进行了彻底验证，显示出与早期发现的强烈一致性。

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引用次数: 0

Superhydrophobic surfaces on supercritical airfoils: mitigating ice formation and enhancing performance 超临界翼型上的超疏水表面：减轻结冰和提高性能

Q1 Chemical Engineering

International Journal of Thermofluids

Pub Date : 2026-01-12 DOI: 10.1016/j.ijft.2026.101557

Mohammad Sameti , Sahar Ghasemipour , Ebrahim Najafi

Superhydrophobic surfaces are characterized by low surface energy and micro- to nano-scale roughness. These properties cause fluids to slide over the surface, thereby reducing drag and adhesion, and resulting in a lower drag coefficient. The drag coefficient, adhesion, and shear stress are critical parameters in airfoil performance evaluation. In this study, the effects of slip length and superhydrophobic boundary conditions on the aerodynamic performance of the SC(2)-410 airfoil were investigated numerically at various Mach numbers and altitudes. Superhydrophobic boundary conditions reduce humidity-induced adhesion on the airfoil surface. Comparative analyses were conducted between slip and no-slip boundary conditions, focusing on shear stress as well as drag and lift coefficients. Superhydrophobicity was found to decrease both shear stress and fluid adhesion to the surface. As slip length increases, the drag coefficient decreases while the lift coefficient increases, compared to conventional surfaces. When the Mach number increases from 0.6 to 0.8, the reductions in drag and enhancements in lift become more pronounced. Additionally, altitude significantly affects the calculation of lift and drag coefficients by influencing relative humidity. As altitude increases, relative humidity tends to rise, which leads to an increase in the drag coefficient and a decrease in the lift coefficient. Superhydrophobic surfaces help mitigate the negative impact of humidity on aerodynamic performance.

超疏水表面具有低表面能和微纳米级的粗糙度。这些特性使流体在表面上滑动，从而减少阻力和粘附，从而降低阻力系数。阻力系数、附着力和剪切应力是翼型性能评价的关键参数。在不同的马赫数和高度下，数值研究了滑移长度和超疏水边界条件对SC(2)-410翼型气动性能的影响。超疏水边界条件减少湿度引起的附着在翼型表面。对比分析了滑移和无滑移边界条件，重点分析了剪切应力以及阻力和升力系数。发现超疏水性可以降低剪切应力和流体与表面的粘附。与常规表面相比，随着滑移长度的增加，阻力系数减小，升力系数增大。当马赫数从0.6增加到0.8时，阻力的减少和升力的增强变得更加明显。此外，海拔高度通过影响相对湿度显著影响升力和阻力系数的计算。随着海拔高度的增加，相对湿度呈上升趋势，导致阻力系数增大，升力系数减小。超疏水表面有助于减轻湿度对空气动力学性能的负面影响。

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引用次数: 0

Numerical study of micro polar fluid flow over a stretching sheet with darcy–forchheimer drag, thermal radiation, dufour effect, and heat source 考虑达西-福海默阻力、热辐射、杜福效应和热源的微极流体在拉伸板上流动的数值研究

Q1 Chemical Engineering

International Journal of Thermofluids

Pub Date : 2026-01-10 DOI: 10.1016/j.ijft.2026.101556

S. Karthik , D. Iranian , C. Subramanian , V. Lakshmi , Qasem Al-Mdallal

This study is significant for advancing the design of porous heat-transfer systems such as geothermal exchangers, catalytic reactors, and polymer processing units by analyzing how multiple physical mechanisms jointly influence micropolar fluid behavior. The work numerically investigates the combined effects of Darcy–Forchheimer drag, thermal radiation, Dufour diffusion, and internal heat generation on the flow, micro rotation, and heat-transfer characteristics of a micropolar fluid over a stretching sheet embedded in a porous medium.The governing nonlinear partial differential equations were transformed into coupled ordinary differential equations through similarity transformations and solved using the Runge–Kutta–Fehlberg (RKF45) method with a shooting technique to ensure convergence and precision. Results reveal that Darcy and Forchheimer parameters substantially reduce fluid velocity due to enhanced porous resistance, whereas radiation and heat-generation parameters elevate the temperature profile within the boundary layer. An increase in the micropolar coupling parameter intensifies micro rotation and modifies near-wall shear stress behavior, while the Darcy number exhibits the strongest influence by markedly decreasing the heat-transfer rate as porosity resistance rises. Despite extensive research on micropolar and nanofluid flows through porous media, few studies have addressed the combined nonlinear influence of Darcy–Forchheimer drag, radiative heat transfer, Dufour diffusion, and internal heat generation. The present unified model incorporates these mechanisms to capture their interactive effects on momentum and energy transport, offering new physical insights for optimizing thermal management in porous and radiative fluid systems.

该研究通过分析多种物理机制如何共同影响微极流体行为，对推进地热交换器、催化反应器和聚合物处理装置等多孔传热系统的设计具有重要意义。该工作数值研究了达西-福希海默阻力、热辐射、杜福尔扩散和内部产热对微极流体在多孔介质中拉伸薄片上的流动、微旋转和传热特性的综合影响。通过相似变换将控制非线性偏微分方程转化为耦合常微分方程，采用RKF45 （Runge-Kutta-Fehlberg, RKF45）法求解，保证了收敛性和精度。结果表明，Darcy和Forchheimer参数由于孔隙阻力增强而显著降低了流体速度，而辐射和产热参数则提高了边界层内的温度剖面。微极性耦合参数的增加增强了微旋转并改变了近壁剪切应力行为，而Darcy数的影响最大，随着孔隙阻力的增加，传热速率显著降低。尽管对微极流体和纳米流体在多孔介质中的流动进行了广泛的研究，但很少有研究涉及达西-福海默阻力、辐射传热、杜福尔扩散和内部产热的非线性综合影响。目前的统一模型包含了这些机制，以捕捉它们对动量和能量输运的相互作用，为优化多孔和辐射流体系统的热管理提供了新的物理见解。

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引用次数: 0

Corrosion effects on a leakage steam control valve: analysis and risk assessment on the biodiesel plant case study 泄漏蒸汽控制阀的腐蚀效应：生物柴油装置案例分析与风险评估

Q1 Chemical Engineering

International Journal of Thermofluids

Pub Date : 2026-01-08 DOI: 10.1016/j.ijft.2026.101554

Anggara Dwita Burmana , Rondang Tambun , Taslim , Barbara Ernst , Yacine Benguerba , Iriany

General surface erosion can be caused by the continuous exposure of metal surfaces to corrosive materials, resulting in further weight loss. This happened in the steam control valve, where continuous exposure to the steam flow rate resulted in erosion of the control valve wall. The purpose of this study is to discuss the causes of steam control valve failure due to corrosion in a biodiesel plant using the gravimetric and salt spray methods, based on the effects caused, and to review the safety risks and implication in more detail. Corrosion which occurred in the first year was 0.7321 mm/year, while corrosion which occurred in years 12 to 15 was relatively more stable at about 0.005 mm/year. Weight and metal losses during the first year were 45 g/year and 0.6052 mm/year, while those during the 14th to 15th years were relatively stable at about 4 g/years and 0.0630 mm/years. The results of the control valve salt spray chamber measurements are value obtained shows that higher NaCl concentration causes higher corrosion. In this observation, the highest value obtained was 0.3181 mm/year at 20% NaCl concentration, while the lowest value was 0.1548 mm/year at 5% NaCl concentration. A robust maintenance schedule helps identify early signs of wear and corrosion, allowing for timely intervention. Implementing a comprehensive maintenance and predictive programme will save time and reduce operating costs for a biodiesel plant.

由于金属表面持续暴露于腐蚀性材料中，导致进一步的重量损失，通常会引起表面侵蚀。这种情况发生在蒸汽控制阀中，连续暴露在蒸汽流量下导致控制阀壁的侵蚀。本研究的目的是利用重量法和盐雾法探讨生物柴油装置蒸汽控制阀因腐蚀而失效的原因，并根据所造成的影响对其安全风险和影响进行更详细的审查。第一年发生的腐蚀为0.7321 mm/年，而12至15年发生的腐蚀相对稳定，约为0.005 mm/年。第1年的失重和金属损失量分别为45 g/年和0.6052 mm/年，第14 ~ 15年的失重和金属损失量相对稳定，分别为4 g/年和0.0630 mm/年左右。控制阀盐雾室测量结果表明，NaCl浓度越高，腐蚀越严重。结果表明，在20% NaCl浓度下，其最大值为0.3181 mm/年，在5% NaCl浓度下，其最小值为0.1548 mm/年。强有力的维护计划有助于识别磨损和腐蚀的早期迹象，从而及时进行干预。实施全面的维护和预测计划将节省时间并降低生物柴油厂的运营成本。

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引用次数: 0

Study of aspect ratio effect in combined shear-driven and pressure-difference driven flow characterization of a third grade fluid in a rectangular channel 矩形通道中三级流体剪切-压差联合流动特性的展弦比效应研究

Q1 Chemical Engineering

International Journal of Thermofluids

Pub Date : 2026-01-07 DOI: 10.1016/j.ijft.2026.101552

Ayusman Nayak, Rajiva Lochan Mohanty, Sumanta Chaudhuri

Combined shear-driven and pressure-difference driven flow of a third grade fluid through a rectangular channel is studied as it has wide applications in extrusion, glass-fibre drawing, blood flow in arteries etc.. Pressure-difference driven flow case can be retrieved by setting the upper walls velocity to be zero. First, governing equation is formulated from the constitutive equation of third grade fluid considering hydro-dynamically fully developed flow, where the axial velocity is independent of the axial coordinate. The dimensionless governing equation is solved using the least square method using Symbolic Computation in MATLAB. As no experimental result or other numerical or analytical results are reported in the literature, the equation is again solved by least square homotopy perturbation method and standard numerical technique. Results from both these methods are compared for validation. In addition, velocity distribution in the limit of vanishing aspect ratio is compared with that of the previously reported results of third grade fluid flow between parallel plates. In both the cases, results are in close match which validate the results of the present study. Influence of aspect ratio, third grade fluid parameter on velocity distribution are analyzed. In case of combined shear- driven and pressure-difference driven flow, the effect of favourable and adverse pressure gradient is discussed. It is noted that increase in aspect ratio, arrests the flow separation and back flow in the channel. Increase in third-grade fluid parameter also increases the flow resistance with consequent prevention of flow separation and back flow.

研究了剪切驱动和压差驱动三级流体在矩形通道中的联合流动，该通道在挤压、玻璃纤维拉伸、动脉血流等方面有广泛的应用。通过将上壁速度设置为零，可以恢复压差驱动的流动情况。首先，考虑流动力充分发展，轴向速度与轴向坐标无关，由三级流体本构方程推导控制方程；利用MATLAB中的符号计算，采用最小二乘法求解无量纲控制方程。由于文献中没有实验结果，也没有其他数值或解析结果的报道，方程再次采用最小二乘同伦摄动法和标准数值技术求解。对两种方法的结果进行了比较验证。此外，还将消失长径比极限下的速度分布与已有报道的平行板间三级流体流动结果进行了比较。在这两种情况下，结果是密切匹配的，验证了本研究的结果。分析了展弦比、三级流体参数对速度分布的影响。在剪切驱动和压差驱动联合流动的情况下，讨论了有利压力梯度和不利压力梯度的影响。宽高比的增大抑制了流道内的流动分离和回流。三级流体参数的增加也增加了流动阻力，从而防止了流动分离和回流。

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引用次数: 0

Research on preparation and thermal performance of carbon sphere-modified PCM perlite-paraffin composite 碳球改性PCM珍珠岩-石蜡复合材料的制备及热性能研究

Q1 Chemical Engineering

International Journal of Thermofluids

Pub Date : 2026-01-06 DOI: 10.1016/j.ijft.2026.101553

Qi Chen , Wei Na , Quanhe Gai , Jie Yang , Yan Wang , Xucheng Chen , Zhao Cao , Shuguang Li

A carbon sphere modification approach was developed to construct a perlite/paraffin composite phase change material (CS-PCM) with both high photothermal conversion efficiency and stable thermal energy storage capability. The surface of the perlite matrix was modified using sodium carboxymethyl cellulose (CMCNa), increasing the water contact angle from 0° to 67° Micro/nanoscale carbon spheres (0.1–20 μm) derived from tea waste were embedded into a resin matrix, demonstrating superior performance compared to conventional carbon-based additives. The CS-PCM was incorporated into thermal storage walls through a scalable manufacturing process, with phase change materials comprising 30 % of the system. Experimental application in high-latitude greenhouses during winter confirmed that the integrated system maintained an internal crop environment at 13.6 ± 4 °C. This composite material features both low cost and reduced carbon emissions. The results offer a promising solution for thermal management in protected agriculture in cold regions and provide a theoretical and technical reference for the design of multifunctional phase change materials.

采用碳球改性的方法制备了光热转换效率高、储热性能稳定的珍珠岩/石蜡复合相变材料（CS-PCM）。采用羧甲基纤维素钠（CMCNa）对珍珠岩基体表面进行改性，将水接触角从0°增加到67°，将茶渣制备的微纳碳球（0.1 ~ 20 μm）嵌入树脂基体中，表现出优于传统碳基添加剂的性能。CS-PCM通过可扩展的制造工艺集成到储热壁中，相变材料占系统的30%。冬季在高纬度温室的试验应用证实，该综合系统将作物内部环境维持在13.6±4°C。这种复合材料具有成本低、碳排放少的特点。研究结果为寒冷地区保护农业的热管理提供了一种有希望的解决方案，并为多功能相变材料的设计提供了理论和技术参考。

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引用次数: 0

A stable high mixing performance of Koch fractal array obstacle-based micromixer 基于Koch分形阵列障碍物的微混合器具有稳定的高混合性能

Q1 Chemical Engineering

International Journal of Thermofluids

Pub Date : 2026-01-05 DOI: 10.1016/j.ijft.2026.101550

Lilik Hasanah , Fasya Nur Afifah , Roer Eka Pawinanto , Muhammad Iqbal , Gilang Gumilar , Muhammad Yusuf , Widyaningrum Indrasari , Ida Hamidah , Jumril Yunas , Budi Mulyanti

Passive micromixers are essential components in microfluidic systems, enabling efficient fluid mixing under laminar flow conditions without external energy input. This study numerically investigates the mixing performance and flow mechanisms of passive micromixers incorporating Koch fractal obstacle arrays. Four fractal geometries—Secondary Snowflakes Fractal (SSF), Tertiary Snowflakes Fractal (TSF), Rounded Secondary Snowflakes Fractal (RSSF), and Rounded Tertiary Snowflakes Fractal (RTSF) are analyzed in both same-side and different-side configurations using COMSOL Multiphysics over a wide Reynolds number range (Re = 0.1–100). Model validation against benchmark obstacle-based micromixers from the literature shows good agreement in mixing efficiency and pressure drop, confirming the reliability of the numerical framework. The results demonstrate that Koch fractal obstacles enhance mixing through flow splitting, stretching, and chaotic advection. Among all configurations, the different-side rounded tertiary snowflake fractal (DSRTSF) exhibits the most stable and consistently high mixing performance, achieving a maximum mixing efficiency of 97.70% at a Reynolds number (Re) of 0.1. Performance index analysis further reveals that rounded fractal geometries provide a favorable balance between mixing efficiency and pressure drop. These findings offer practical design guidelines for high-performance fractal obstacle-based passive micromixers in lab-on-a-chip and microfluidic applications.

无源微混合器是微流体系统的重要组成部分，它可以在层流条件下实现高效的流体混合，而无需外部能量输入。本文对含Koch分形障碍物阵列的无源微混合器的混合性能和流动机理进行了数值研究。使用COMSOL Multiphysics在宽雷诺数范围（Re = 0.1-100）下分析了四种分形几何形状——二次雪花分形（SSF）、三级雪花分形（TSF）、圆形二级雪花分形（RSSF）和圆形三级雪花分形（RTSF）。针对文献中基于障碍物的基准微混合器的模型验证表明，混合效率和压降具有良好的一致性，证实了数值框架的可靠性。结果表明，科赫分形障碍物通过气流分裂、拉伸和混沌平流增强混合。不同侧面圆形三级雪花分形（DSRTSF）的混合性能最稳定，在雷诺数（Re）为0.1时，混合效率最高，达到97.70%。性能指标分析进一步表明，圆形分形几何形状在混合效率和压降之间提供了良好的平衡。这些发现为芯片实验室和微流控应用中基于分形障碍物的高性能无源微混合器提供了实用的设计指南。

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引用次数: 0

CFD analysis of temperature-driven flow for passive HVAC applications in Irish homes 爱尔兰家庭被动式暖通空调应用中温度驱动流量的CFD分析

Q1 Chemical Engineering

International Journal of Thermofluids

Pub Date : 2026-01-04 DOI: 10.1016/j.ijft.2026.101551

Rahul D , Anjaneya G , Manjunatha N K , Sunil S , Mohan Kumar G R , Girish Kumar G S , C.Durga Prasad , Nithesh Kumble Gokuldas , Nilesh H. Khandare , Nimona Hailu

Buoyancy-driven ventilation is a sustainable alternative to conventional HVAC systems, leveraging temperature differences to induce airflow. This study analyzes buoyancy-driven flow using Computational Fluid Dynamics (CFD) in ANSYS Fluent to evaluate its feasibility for natural ventilation. The simulation models a contracting pipe with internal heating fins, made of copper, which gets heated by sunlight up to 60 °C, inducing airflow through natural convection. A pressure inlet at 0 gauge pressure and a pressure outlet at −20 Pa were applied. The steady-time simulation used the realizable k-ε turbulence model with buoyancy effects enabled and the energy equation enabled. Results show flow from the inlet to the outlet domain, which was confirmed by evaluating volumetric flow rate at the outlet and observing velocity streamlines, confirming that the design effectively enhances natural ventilation. A grid independence study was conducted by evaluating the Grashof number (Gr) on one of the heated walls. Grid independence was achieved with 693635 elements with a Grashof number value of 3*e¹⁰. A parametric study was conducted for varying wall temperatures (30 °C, 40 °C, 50 °C, and 60 °C), and the Volumetric flow rate at the outlet was monitored. Results indicate a linear trend between temperature and volumetric flow at the outlet, proving that more air can be expelled with higher blade temperatures.

浮力驱动通风是传统暖通空调系统的可持续替代方案，利用温差诱导气流。本研究利用ANSYS Fluent中的计算流体动力学（Computational Fluid Dynamics， CFD）对浮力驱动的流动进行分析，以评估其用于自然通风的可行性。该模拟模拟了一个内部带有铜制发热片的收缩管道，该管道被阳光加热到60°C，通过自然对流诱导气流。施加0表压力的压力入口和−20 Pa的压力出口。稳态时间模拟采用可实现的k-ε湍流模型，启用浮力效应并启用能量方程。结果表明，通过对出口体积流量的评估和对速度流线的观察，证实了从进口到出口的流动，证实了该设计有效地增强了自然通风。通过对其中一个加热壁面的Grashof数（Gr）进行评估，进行了网格独立性研究。使用693635个元素实现网格独立性，Grashof数值为3*e10。在不同的壁面温度（30°C、40°C、50°C和60°C）下进行了参数化研究，并监测了出口的体积流量。结果表明，出口温度与体积流量呈线性关系，表明叶片温度越高，排风量越大。

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引用次数: 0

Thermal and mass transfer prediction of Casson based nanofluid flow over an exponential stretching sheet using a Multi-Task Neural Network approach 用多任务神经网络方法预测卡森纳米流体在指数拉伸片上的传热传质

Q1 Chemical Engineering

International Journal of Thermofluids

Pub Date : 2026-01-03 DOI: 10.1016/j.ijft.2026.101547

S Raghu , K.M Niranjan , Venkanagouda M Goudar , N Neelima , K Vinutha , J.K Madhukesh

The precise forecasting of thermal and mass transportation properties in a non-Newtonian nanofluid circulation is vital for the design and development of efficient thermal management systems, especially in micro-scale electronic devices, polymer processing, and biomedical equipment. In this context, the current work inspects the thermal and mass distribution of Casson nanofluid composed of SWCNT nanoparticles and sodium alginate-based liquid over an exponential stretching surface in the presence of inclined magnetic field, chemical reaction, slip impact, and non-uniform heat source/sink physical phenomena. The effective transport properties of these nanofluids strongly depend on their molecular structure, necessitating the use of topological indices. Similarity transformations are utilized to alter the governing partial differential equations (PDEs) to a system of ordinary differential equations (ODEs), and solutions are obtained using Runge Kutta Fehlberg - 4^th 5^th scheme and the shooting technique. The outcomes of the numerical calculations are presented and visualized with the aid of graphs. To improve the predictive capability, a Multi-Task Neural Network is developed and offers improved generalization across a wide range of parameter values. The numerical outcomes show that improving Casson, inclination angle, and magnetic parameter values slows down the velocity, while thermal slip declines the temperature profile. The improvement in the rate of heat and mass transfer improves up to 2.3753% and 10.5201% in the presence of Casson nanofluid for changes in inclination angle and magnetic field. The outcomes of the neural network model show strong agreement among the numerical and MTNN predictions, with a total loss of 0.000, and R² for Cf, Nu, and Sh tasks are found to be 0.9999, 0.9997, and 0.9994, respectively, indicating a perfect fit of the data for predicted and target values with excellent convergence and effective numerical stability.

精确预测非牛顿纳米流体循环中的热传递和质量传递特性对于设计和开发高效的热管理系统至关重要，特别是在微尺度电子器件、聚合物加工和生物医学设备中。在此背景下，本研究在倾斜磁场、化学反应、滑移冲击和非均匀热源/汇物理现象的存在下，考察了由swcnts纳米颗粒和海藻酸钠基液体组成的Casson纳米流体在指数拉伸表面上的热分布和质量分布。这些纳米流体的有效传输特性强烈依赖于它们的分子结构，因此需要使用拓扑指标。利用相似变换将控制偏微分方程转化为常微分方程，并利用Runge - Kutta - Fehlberg - 4 - 5格式和射击技术得到了控制偏微分方程的解。数值计算的结果用图形表示和显示。为了提高预测能力，开发了一种多任务神经网络，并在广泛的参数值范围内提供了改进的泛化。数值计算结果表明，卡森、倾角和磁参数值的增大使速度减慢，而热滑移使温度剖面减小。在卡森纳米流体的存在下，由于倾角和磁场的变化，传热传质率提高了2.3753%，传质率提高了10.5201%。神经网络模型的数值预测结果与MTNN预测结果吻合较好，总损失为0.000，Cf、Nu和Sh任务的R2分别为0.9999、0.9997和0.9994，表明预测值与目标值拟合较好，具有较好的收敛性和数值稳定性。

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引用次数: 0

Waste heat recovery from diesel engines for water desalination 柴油发动机废热回收用于海水淡化

Q1 Chemical Engineering

International Journal of Thermofluids

Pub Date : 2026-01-02 DOI: 10.1016/j.ijft.2026.101548

Maryam Nooman AlMallahi , Anas Bin Abdul Hadi , Montaser Mahmoud , Mohammad Ali Abdelkareem , Abdul Ghani Olabi , Saeed Alnuaimi , Mahmoud Elgendi

Desalination is vital to overcome water scarcity and provide a reliable freshwater supply. Current desalination methods require significant energy, resulting in high costs and notable environmental pollution. Utilizing waste heat (WH) in desalination systems can lower energy consumption, greenhouse gas (GHG) emissions, and operational costs. The WH can be driven directly by thermal energy or indirectly through various waste-heat recovery methods. This paper reviews waste heat recovery from diesel engines in desalination systems. The paper categorizes the application of WH for thermal desalination technologies, including multi-stage flash desalination (MSF), humidification and dehumidification (HDH), and multi-effect desalination (MED). Additionally, it classifies waste heat recovery techniques, such as thermoelectric generators, power cycles, waste heat-to-heat conversion, and thermal energy storage systems. Waste-to-power energy recovery systems can generate the power required to drive desalination processes. When combined with the WHR system, the freshwater production rate reached 146 kg⋅h^-1, and a net power of 354.65 kW was recovered. Thus, using WH to desalinate water has demonstrated significant economic and environmental benefits in many industries, especially maritime vessels. It reduces the need for large storage tanks and regular supplies, ultimately increasing sustainability.

海水淡化对于克服水资源短缺和提供可靠的淡水供应至关重要。目前的海水淡化方法需要大量的能源，导致高成本和显著的环境污染。在海水淡化系统中利用废热可以降低能源消耗、温室气体排放和运营成本。WH可以直接由热能驱动，也可以通过各种余热回收方法间接驱动。本文综述了海水淡化系统中柴油机余热回收的研究进展。本文对WH在热脱盐技术中的应用进行了分类，包括多级闪蒸脱盐（MSF）、加湿除湿（HDH）和多效脱盐（MED）。此外，它还分类了废热回收技术，如热电发电机、电力循环、废热到热转换和热能储存系统。废物发电能源回收系统可以产生驱动海水淡化过程所需的电力。与WHR系统结合使用时，淡水产量达到146 kg⋅h-1，回收净功率354.65 kW。因此，在许多行业，特别是海上船舶中，使用水淡化已经证明了显著的经济和环境效益。它减少了对大型储罐和常规供应的需求，最终提高了可持续性。

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