Hydrothermal Behavior Research Articles

Impact of hydro-thermal behaviour around a buried pipeline in cold regions

The lifecycle service performance of infrastructure such as buried pipelines, pavement structures, and building foundations can be adversely affected by the process of freezing and thawing action in cold regions. The complicated and dynamic interactions of the temperature distribution and moisture migration around a buried pipeline, which have a significant influence on the stability mechanism of a cold-region pipeline, play a critical role in crude oil/gas pipeline design in cold regions. In this study, a hydro-thermal coupled mathematical model based on energy and mass equilibrium conservation principles is established for estimating the distribution characters of thermal field and water field around a buried pipeline, and several calculation conditions should be computed to explore the heat-moisture states in the surrounding soils under unfavourable conditions. Subsequently, the optimal methods based on thermal conductivity and thermal insulation thickness are developed, and the relationship among the thermal insulation effect, thermal parameters and thickness can be obtained to evaluate the impact of hydro-thermal behaviour in the surrounding soils in cold regions. Furthermore, this method has potential applications in pipeline behaviour analyses and further investigations in cold regions.

Interacting influences of Lorentz force and bleeding on the hydrothermal behaviors of nanofluid flow in a trapezoidal recess with the second law of thermodynamics analysis

This study deals with the analysis of the interacting influences of Lorentz force and bleeding on the hydrothermal behaviors of magnetohydrodynamic (MHD) nanofluid flow and entropy generation in a trapezoidal recess. This trapezoidal recess is created by two inclined steps in a horizontal channel. The Lorentz force is appeared due to the existence of a magnetic field in the flow domain. The Brownian motion influences on the effective characteristics of CuO -water nanofluid are considered to have more accuracy. The effects of bleeding coefficients (−0.005 ≤ Vw ≤ + 0.005), Hartmann number (0 ≤ Ha ≤ 60) and concentration of solid nanoparticles (0 ≤ ϕ ≤ 0.04) on the flow characteristics, heat transfer and flow irreversibility rates are investigated. The results show that the trends and values of friction coefficient, Nusselt number and entropy generation number can be different at the various magnitudes of Ha and Vw, whereas the ϕ parameter only increases the values of them. These differences are related to the variations of streamlines contours against the Ha, Vw and ϕ parameters.

Experimental hydrothermal behavior of hybrid nanofluid for various particle ratios and comparison with other fluids in minichannel heat sink

The effect of the particle mixture ratio in hybrid nanofluid on minichannel heat sink performance is analyzed experimentally. The heat sink, made of aluminium, contains nine parallel rectangular minichannels having cross section of 1 mm × 3 mm with 30 mm length. Total 0.01% volume concentration of Al2O3 and MWCNT nanoparticles for various mixing ratios (10:0, 8:2, 6:4, 4:6, 2:8 and 0:10) is used to synthesize water-based hybrid nanofluids. Different parameters as volumetric flow rate (0.17–0.5 LPM), fluid inlet temperature (20–40 °C) and heat flux (8.3 W/cm2) are considered. Present Al2O3-MWCNT hybrid nanofluid is compared as well with hybrid nanofluids available in literature based on both thermophysical-transport and hydrothermal properties. Heat transfer coefficient, Nusselt number, pressure drop and friction factor increase with an increase in MWCNT fraction in hybrid nanofluid. Maximum heat transfer coefficient and pressure drop increments are 44.1% and 68.1%, respectively, for MWCNT nanofluid. Inlet fluid temperature has a negative effect on pressure drop and positive effect on heat transfer coefficient. Nusselt number to friction factor ratio is observed maximum at 6:4 mixing ratio of Al2O3 and MWCNT. Al2O3 + MWCNT (optimum mixing ratio of 6:4) hybrid nanofluid is found better as compared to existing hybrid nanofluids at total volume concentration of 0.01%.

Hydro-thermal behaviour determination and optimization of fully developed turbulent flow in horizontal concentric annulus with ethylene glycol and water mixture based Al2O3 nanofluids

In this study, a comprehensive analysis of forced convection heat transfer and pressure drop through a concentric annulus heated from the inner wall and utilizing ethylene glycol (EG)-water based nanofluids for fully developed turbulent flow are conducted. In this context, effects of Reynolds number (10000–100,000), annulus radius ratio (0.1–0.9), EG concentration (0%–60%), nanoparticle volume fraction (0%- 1.5%) and nanofluid inlet temperature (0 °C - 50 °C) on Nusselt Number and pumping power have been analysed. To obtain nanofluids thermophysical properties, experimental data is implemented. To calculate the Nusselt number and friction factor, generalized formulations obtained from the direct numerical simulation are used. It is concluded that the Nusselt number increases with increasing Reynolds number and EG concentration while decreases with increasing radius ratio and inlet temperature in all conditions. In most cases, as nanoparticle volume fraction increases, Nusselt number increases while there are some opposite conditions. Besides, it is determined that the pumping power increases with increasing Reynolds number, EG concentration, nanoparticle volume fraction and radius ratio and decreases with increasing nanofluid inlet temperature. In addition, Response Surface Methodology and desirability function approach is implemented to determine the optimum operating conditions by maximizing Nusselt Number and minimizing pumping power for different scenarios.

Particle ratio optimization of Al2O3-MWCNT hybrid nanofluid in minichannel heat sink for best hydrothermal performance

Interesting hydrothermal behavior of hybrid nanofluid containing combination of dissimilar particles (completely different in terms of shape, size and properties) by changing their ratio is unexplored yet, which is analyzed experimentally for minichannel heat sink. Nine parallel rectangular minichannels are used in the heat sink each of which has 1 mm width, 3 mm depth and 30 mm length. Al2O3–MWCNT/water hybrid nanofluid of 0.01% volume concentration with various nanoparticle mixture ratios is used as coolant to analyze the effect of Reynolds number and working fluid inlet temperature. Nanoparticles mixing ratios (5:0, 4:1, 3:2, 2:3, 1:4 and 0:5) have been taken as volume ratios. Convective heat transfer coefficient, Nusselt number, pressure drop and friction factor increase with an increase in fraction of MWCNT in hybrid nanofluid. A maximum enhancement of 44.02% has been observed for the convective heat transfer coefficient with MWCNT (5:0) hybrid nanofluid as compared to water. Maximum pressure drop has been increased by 51.2% over base fluid at an inlet temperature of 20 °C for the MWCNT (5:0) hybrid nanofluid. Inlet fluid temperature has negative effect on pressure drop and positive effect on heat transfer. The observed optimum volumetric mixing ratio of Al2O3 and MWCNT is around 3:2, for which hybrid nanofluid yields maximum heat transfer coefficient to pressure drop ratio. Performance evaluation criteria (PEC) has been evaluated greater than 1 for all the nanofluids, which concludes that nanofluids are better option as compared to conventional fluid (DI water). Based on the experimental data, correlations for Nusselt number and friction factor have been introduced with R2 values of 98.8% and 96.3%, respectively, and compared with available correlations.

Effect of complex turbulator on heat transfer of nanomaterial considering turbulent flow

To exhibit the nanomaterial hydrothermal behavior within a duct, FVM has been utilized and to augment the performance, helical complex device was incorporated. To achieve the formulation of problem, K–ɛ model was applied with considering CuO–water nanomaterial. Outputs in forms of velocity and temperature contours have been extracted. Stronger tangential contact of carrier fluid with outer wall guarantees the thinner boundary layer with rise of inlet velocity and friction loss augments. The increase of turbulator width results in augment of Nu owing to greater tangential flow and more fluctuations.

Stochastic coupling analysis of uncertain hydro-thermal properties for embankment in cold regions

Abstract In cold regions, the uncertain thermal property of embankment is an important basis for the safety design and construction. Especially for the high water content ground, the engineering properties are very complex and special because of the existence of moisture migration, which can cause a strong coupling effect for the stochastic hydro-thermal processes. In order to evaluate the uncertain hydro-thermal properties of embankment in cold regions, a stochastic analysis on coupled moisture migration, thermal conduction and ice-water phase transition is presented. The hydrothermal parameters are considered as random fields. A method to calculate local average variance from point variance is proposed, and a coupled modeling of stochastic hydro-thermal processes for the frozen soil is developed. The uncertain hydro-thermal behavior of an embankment along the Qinghai-Tibet railway is calculated by a stochastic coupling program, and the change rule of statistical characteristics for the temperature and unfrozen water content is obtained and analyzed. The study provides a new way to evaluate the stochastic hydro-thermal properties of embankment in cold regions, and it shows that water migration can promote uncertain heat transfer and increase the validation of temperature characteristic in frozen soil. The larger standard deviation of unfrozen water content is at the bottom of the embankment on July 15 and October 15. The average standard deviations of temperature and unfrozen water content increase with time, and the variability of uncertain hydro-thermal properties are becoming more and more obvious. These results can improve our understanding of the stochastic coupling effect of uncertain hydro-thermal process for embankment and provide a theoretical basis for design, operation and maintenance of embankment engineering in cold regions.

Hydrothermal processes in the Fen alkaline-carbonatite complex, southern Norway

We present detailed textural and chemical analyses of the hydrothermal sulfide- and REE-Th-Nb-mineralization observed in the Fen complex (southern Norway), which is the biggest carbonatite-related REE and Th deposit in Europe. The alkaline silicate rocks and carbonatites of the Fen complex underwent two hydrothermal alteration events that caused (i) the formation of sulfides and (ii) (re)-mobilization of REE, Fe and Al. This renders the Fen complex an ideal locality to study the genesis of hydrothermal sulfide and REE mineralization in carbonatites. Our observations record a hydrothermal alteration history of the Fen carbonatite complex, which is relevant to many carbonatite complexes worldwide.The first alteration event (pyrite-stage) caused the crystallization of sulfides (mostly pyrite) in all lithologies and was induced by a sulfide-rich fluid 1 that was probably derived from adjacent mafic alkaline silicate rocks. Veins formed during this hydrothermal event show a typical succession from magnetite via pyrite I + hematite + magnetite to pyrite II.A subsequent alteration event is characterized by the interaction of two evolving fluids, namely (1) a REE-rich fluid 2 that was probably derived from the carbonatites (autometasomatic fluid) and (2) an oxidizing meteoric fluid 3 that mainly introduced Si and was in equilibrium with the basement host rocks. The interaction of these two fluids with the carbonatitic rocks resulted in various characteristic types of calcite-hematite rocks locally called rødberg. During their late-stage silicification by fluid 3, P was mobilized from magmatic apatite and reprecipitated in close-by rødberg veins as small fluorapatite-monazite veins.The interaction of the carbonatite-derived fluid 2 and meteoric fluid 3 also resulted in the formation of distinct zones of LREE-phases, notably REE-F-carbonates (bastnäsite, parisite, synchysite), monazite and allanite, and HREE-phases (including samarskite, aeschynite and an unnamed Nb-Fe-REE-Th-oxide. The most pronounced HREE-enrichment occurs in domains of strongest hydrothermal alteration, which was probably caused by preferential precipitation of HREE-rich complexes coupled with later partial leaching of LREE by F-rich fluids during silicification. Thorium-rich minerals were precipitated in close association with HREE-rich minerals implying similar hydrothermal behaviour of Th and HREE.

Heat transfer enhancement inside semi-insulated horizontal pipe by controlling the secondary flow of oil-based ferro-fluid in the presence of non-uniform magnetic field: A general correlation for the Nusselt number

In the present study, hydrodynamic and hydrothermal behavior of the laminar nano-fluid actuated by the non-uniform magnetic field in a horizontal semi-insulated tube was numerically investigated. Firstly, the impact of key parameters such as Reynolds number (Re), magnetic field intensity (Mn), wall heat flux (q) as well as the wire location (as a source of magnetic field producer) was examined on the flow and heat transfer characteristics and compared with the non-magnetic case. Numerical results showed that the heat transfer and pressure drop in the presence of the magnetic field were about 3.7 and 1.8 times higher than the non-magnetic case (Re = 500, Mn = 5.7e8), respectively. As a result, to gain a more general conclusion, the effectiveness parameter (ε) was evaluated in different vital situations, in which both heat transfer and pressure drop were involved. Accordingly, using the magnetic field is affordable to increase heat transfer in the practical works. Finally, a general correlation for the Nusselt as a function of non-dimensional length (x*), magnetic number (Mn) and non-dimensional heat flux (Q*mag) is presented with an average error of 3.43%.

Influence of various shapes of CuO nanomaterial on nanofluid forced convection within a sinusoidal channel with obstacles

Heat transfer intensification is significant for enhancement of the performance of various industrial uses such as condensers. In addition, the presence of nanofluid considerably increases the thermal features of carrier fluid. In current paper, CuO nanoparticles involving different shapes have been employed for heat transfer augmentation in wavy channel with obstacles. This work tries to focus on the main flow pattern and indicate the highest operative terms on the heat rate. In order to do this, computational simulation was applied to simulate hydrothermal behavior. Significant parameter studies were performed to investigate the influences of wavelength and height ratios and velocity inlet. According to obtained results, suitable formula for Nusselt number is offered. Outputs show that Nu goes up with augment of height of obstacle due to increasing in strength of intensity. Also, thinner temperature boundary layer thickness can be seen for greater wavelength ratio. Our finding reveals that heat transfer rate increases more than 55% as the spherical nanoparticles is replace by platelet ones.

Condensation of α-Carbonyl Aldehydes Leads to the Formation of Solid Humins during the Hydrothermal Degradation of Carbohydrates.

Catalytic hydrothermal conversion of carbohydrates could provide a series of versatile valuable platform chemicals, but the formation of solid humins greatly decreased the efficiency of the process. Herein, by studying the hydrothermal degradation behavior and analyzing the degradation paths of kinds of model compounds including carbohydrates, furan compounds, cyclic ketone derivatives, and some simple short carbon-chain oxy-organics, we demonstrate that α-carbonyl aldehydes and α-carbonyl acids are the key primary precursors for humin formation during the hydrothermal conversion process. Then, we analyzed the hydrothermal degradation paths of two simple α-carbonyl aldehydes including glyoxal and pyruvaldehyde and found that the α-carbonyl aldehydes could undergo aldol condensation followed by acetal cyclization and dehydration to form solid humins rich of furan ring structure or undergo Cannizaro route (hydration followed by 1,2-hydride shift) to form corresponding α-hydroxy acids. On the basis of the hydrothermal behavior of the α-carbonyl aldehydes, we mapped the hydrothermal degradation routes of carbohydrates (glucose, fructose, and xylose) and illuminated the formation details of α-carbonyl aldehydes, α-hydroxy acids, γ-lactones, furfural derivatives, and humins. Finally, we deduced the typical structure fragments of humins from three α-carbonyl aldehydes of pyruvaldehyde, 2,5-dioxo-6-hydroxy-hexanal, and 3-deoxyglucosone, all of which could be formed during the hydrothermal degradation of hexose.

Magnetic source effect on EG-CuO nanofluid in a semi-annulus using RBFs

In this study, numerical simulation of hydrothermal behaviour of ethylene glycol based CuO nanofluid in a semi-annulus with a magnetic source is investigated. The non-dimensional governing equations are discretized by radial basis functions in spatial derivatives, and by backward-Euler in temporal derivatives. The effects of dimensionless parameters Hartmann number, Rayleigh number, magnetic number, Eckert number and solid volume fraction are presented both in terms of streamlines, isotherms and vorticity contours, and average Nusselt number through the heated wall. The results show that augmentation in magnetic number accelerates the convective heat transfer at a small Rayleigh number, and at a larger heated inner circle. Convective heat transfer is inhibited with the rise of Hartmann number, and with the increase in Eckert number while it is enhanced with the increase in concentration of nanoparticles and Rayleigh number.

Numerical investigation of the mixed convection of a magnetic nanofluid in an annulus between two vertical concentric cylinders under the influence of a non-uniform external magnetic field

In the present study, the hydrothermal behavior of a magnetic nanofluid (4 vol% magnetite–water) in the annular space between two vertical circular cylinders under the influence of a linear magnetic field with negative gradient is numerically investigated. In particular, the effects of the Grashof number (1000 ≤ Gr ≤ 50,000), Reynolds number (20 ≤ Re ≤ 200), and the annulus radius ratio (1.5 ≤ Do/Di ≤ 3.5) on the hydrothermal characteristics of the magnetic nanofluid are presented in detail. The flow is assumed to be steady, incompressible, and viscous. The two-phase mixture model is used to simulate the flow and heat transfer of the magnetic nanofluid. The three-dimensional governing equations are discretized using the finite volume scheme, while the SIMPLE algorithm is employed to couple the velocity and pressure. Moreover, the second-order upwind scheme is used to discretize the convective terms of the momentum and energy equations. The results show that the skin friction coefficient on the inner and outer walls of the annuli increases and decreases, respectively, by enhancing the Grashof number as well as the ratio of the radius. It is found that the Nusselt number increases by increasing the Grashof number. In the presence of an external magnetic field with the negative gradient, the skin friction coefficient on the inner and outer walls of the annulus is enhanced by decreasing the Reynolds number.

Hydrothermal Production of H2 and Magnetite From Steel Slags: A Geo-Inspired Approach Based on Olivine Serpentinization

The interaction between ultramafic rocks and hot seawater at slow-spreading mid-oceanic ridges triggers hydrothermal redox reactions which are known to produce magnetite and H2 under appropriate pressure and temperature conditions. Steel slags share some common properties with ultramafic rocks. They are composed of anhydrous and refractory minerals formed at temperatures exceeding 1200°C and they contain ferrous iron in comparable amounts. Consequently, both types of materials, natural and anthropogenic, when submitted to hydrothermal conditions are prone to form magnetite and H2 according the simplified redox reaction: 3[FeO] + H2O => Fe3O4 + H2 (1) where [FeO] is the ferrous iron component of the corresponding material that can be present under different mineralogical forms. Since H2 and magnetite, Fe3O4, especially when occurring as nanomaterial, are two valuable products for new-technology applications, the hydrothermal treatment of steel slags can be seen as a way to valorize a by-product of the steel industry of which a few tenths of billion tons are produced yearly. The hydrothermal behavior of steel slags which arise from basic oxygen furnace (BOF) operations and that of olivine, (Mg,Fe)2SiO4, the main mineral constituent of abyssal peridotites, is described here based on literature data. The thermochemical characteristics of Reaction 1 are reviewed for both types of materials in the perspective of optimizing a process that would valorize BOF steel slags for the production of nanomagnetite (and high-purity H2). In particular the kinetics effect of temperature, pH and solution-to-solid mass ratio on the hydrothermal oxidation of wustite (FeO), considered here as an analogue of ferrous-iron component of steel slags, is modeled. The possible role of additive (impurity) on the hydrothermal oxidation of wustite though the catalysis of the water-splitting reaction is discussed. Finally, the lack of kinetics constraints on nanomagnetite growth under hydrothermal conditions in a wide range of pH is identified has a major gap to understand two important issues, (1) the catalysis of abiotic molecules in the course of serpentinization reactions and (2) tailoring the size of the magnetite produced by hydrothermal treatment of BOF steel slags.

Hydro-thermal behaviors of the ground under different surfaces in the Qinghai-Tibet Plateau

The hydro-thermal properties of the ground affect the thermal regimes and surface energy balances. A field experiment in the Qinghai-Tibet Plateau was carried out to analyze the hydro-thermal boundaries, and the variations of the ground temperatures, volumetric unfrozen water contents and matric suctions for different surfaces (i.e., asphalt surface, concrete surface and natural gravel surface). The results show that the asphalt surface significantly changes the permafrost table and ground temperature. The mean annual temperature under the asphalt surface is 2.40 °C higher than that under the concrete surface, and 2.77 °C higher than that under the natural gravel surface. Therefore, the permafrost table under the asphalt surface is deeper than that under the natural gravel and concrete surfaces. In addition, the freezing and thawing processes of the ground under different surfaces are significantly different. Moreover, the volumetric unfrozen water content changes quickly near the ice-water phase transition zone, while the matric suction seldom changes until the volumetric unfrozen water reaches a certain value during the cold seasons, and the volumetric unfrozen water content dramatically changes due to the rainfall during the warm seasons. Furthermore, the volumetric unfrozen water content first decreases, and then increases with depth in the cross sections of the embankments during the cold seasons. The minimum volumetric unfrozen water content lies at the depth of 0.40 m for the natural gravel surface, and 0.90 m for the asphalt and concrete surfaces.

Installation of a thermal energy storage site in an abandoned mine in Picardy (France). Part 1: Selection criteria and equipment of the experimental site

As part of the new French law on energy transition, the Demosthene research project is studying the possibility of reusing old abandoned mines to store thermal energy in the Picardy region. The aim is to store the heat required for a small collective unit, which corresponds to a volume of water of 2000–8000 m3, depending on the temperature (from 15 to 70 °C). An inventory shows around 3700 theoretically available sites in this region. These are mostly shallow dry mines, or mines that are partially flooded with around 1 m of water depth. Based on this water depth and an extraction ratio of 75%, the required mine area is approximately 10,000 m2. From the 40 sites that have a sufficient surface area, only 1 is naturally flooded, although statistically many others will exist that are currently not known. For this experimental site to be reproducible, the decision was made to select dry mines but with a sufficient area to achieve an artificial flooding device. Theoretically, this represents more than a thousand sites in Picardy. The most interesting one is the old limestone mine of Saint-Maximin, where a sealed basin can be built. Before installing an experimental underground thermal energy storage basin in this site, the thermomechanical and hydrothermal behaviors were modeled. The aim was to optimize the position of the various sensors that will be used to monitor the basin, and to predict the future deformations induced on the walls by the thermal variations. A 100-m3 basin, sealed with a liner, was built and fitted with 18 sensors to measure temperature, humidity and strain. These sensors allow the stored water, the rock walls and the surrounding atmosphere to be monitored. This device must now operate for 6 months, i.e. a complete heating–cooling cycle, and its results will be analyzed.

Effects of nanoparticles volume fraction and magnetic field gradient on the mixed convection of a ferrofluid in the annulus between vertical concentric cylinders

In this paper, the thermomagnetic convection of magnetite-water ferrofluid is numerically investigated in the three-dimensional space between two vertical concentric cylinders under the influence of an external magnetic field. The main objective is to study the effect of volume fraction of the magnetic nanoparticles (0.01≤αp≤0.06) with the diameter of 10 nm and positive and negative gradients of the magnetic field (-5×105A/m2≤G≤5×105A/m2) on the hydrothermal behavior of the ferrofluid flow. For this purpose, the two-phase mixture model and the finite volume method are used to simulate the hydrodynamics and thermal behavior of the ferrofluid flow. The simulations are performed for a Reynolds number of 20, Grashof number of 10000, and outer to inner diameter ratio of 2.5. The numerical results indicate that the Kelvin force increases by increasing the volume fraction, decreasing the ferrofluid temperature and increasing the magnetic field gradient. In the presence of an external magnetic field with negative gradient, the skin friction coefficient on the inner wall is enhanced by increasing the volume fraction and the magnetic field gradient but on the outer wall, it decreases by increasing them. Besides, the Nusselt number increases with the increase in the volume fraction and the magnetic field gradient. In addition, positive gradient magnetic fields result in reducing the Nusselt number and friction coefficient on the inner wall, while they increase the friction coefficient on the outer wall.

Nanofluid MHD forced convection heat transfer around the elliptic obstacle inside a permeable lid drive 3D enclosure considering lattice Boltzmann method

In current article, forced convection of aluminum oxide-H2O nanofluid within a permeable non-Darcy 3D domain with a local elliptic heater of constant temperature in appearance of uniform magnetic field was scrutinized. Local elliptic heater of constant high temperature is placed in the center of cavity. Governing equations formulated using Brownian motion impact for nanofluid properties have been solved by lattice Boltzmann method. Influences of permeability, Reynolds number and Lorentz on alumina hydrothermal behavior have been reported. Obtained outputs have proved the growth of the Nusselt number with the lid velocity and permeability of domain, but Nu declines with the Lorentz forces. Conduction improves with augment of magnetic forces.

Hydrothermal Synthesis, Characterization, and Sintering Behavior of Core-Shell Particles: A Principle Study on Lanthanum Strontium Cobaltite Coated with Nanosized Gadolinium Doped Ceria

In this work, nanostructured (La0.6Sr0.4)0.99CoO3 (LSC)-Ce0.8Gd0.2O1.9 (CGO) core-shell particles were prepared by precipitating CGO nanoparticles on the surface of LSC particles under hydrothermal conditions. The as-prepared core-shell particles were sintered by spark plasma sintering (SPS) and conventional sintering, and the microstructure evolution and densification behavior were studied. Dense microstructures were reached using both sintering methods at relatively low temperatures. In the case of SPS, the core-shell architecture was partially maintained and nano-structured CGO grains were formed, while conventional sintering led to the formation of larger CGO grains. This work covers a detailed characterization of (a) the individual LSC-CGO core-shell particles and (b) the composites after densification.

Corrugated conductive partition effects on MHD free convection of CNT-water nanofluid in a cavity

In the present study, free convection in a cavity with a corrugated partition which have different fluids on different parts of the partition was numerically examined. In one of the domains carbon nanotube (CNT)-water nanofluid with an inclined uniform magnetic field is considered. A triangular wave form of conductive corrugated partition is used. The numerical simulation was performed with Galerkin weighted residual finite element method. Various values of pertinent parameters of current thermal configuration such as Rayleigh number (between 104 and 106), Hartmann number (between 0 and 50), magnetic inclination angle (between 0° and 90°), solid particle volume fraction (between 0 and 0.03), number of triangular waves (between 1 and 40), height of triangular waves (between 0.01H and 0.2H) and thermal conductivity ratio (between 0.1 and 100) and their influence on the hydro-thermal behavior were examined. It was observed that significant enhancements in the Nusselt number is obtained with CNTs. The average heat transfer decreases for higher values of Hartmann number but slightly varies as the value of magnetic inclination angle changes. As the number and height of the triangular waves increase, the average heat transfer reduce which are 32% and 27% for the highest values of number and height of triangular waves both for water and nanofluid. For forecasting the average heat transfer coefficient of the current thermal system, a novel method based on Proper Orthogonal Decomposition (POD) and Adaptive-Network-Based Fuzzy Inference System (ANFIS) is used which yields highly accurate results that are computationally inexpensive.