Vented Cavity Research Articles

A Review on Non-Newtonian Nanofluid Applications for Convection in Cavities under Magnetic Field

This review is about non-Newtonian nanofluid applications for convection in cavities under a magnetic field. Convection in cavities is an important topic in thermal energy system, and diverse applications exist in processes such as drying, chemical processing, electronic cooling, air conditioning, removal of contaminates, power generation and many others. Some problems occur in symmetrical phenomena, while they can be applicable to applied mathematics, physics and thermal engineering systems. First, brief information about nanofluids and non-Newtonian fluids is given. Then, non-Newtonian nanofluids and aspects of rheology of non-Newtonian fluids are presented. The thermal conductivity/viscosity of nanofluids and hybrid nanofluids are discussed. Applications of non-Newtonian nanofluids with magnetohydrodynamic effects are given. Different applications of various vented cavities are discussed under combined effects of using nanofluid and magnetic field for Newtonian and non-Newtonian nanofluids. The gap in the present literature and future trends are discussed. The results summarized here will be beneficial for efficient design and thermal optimization of vented cavity systems used in diverse energy system applications.

MHD Nanofluid Convection and Phase Change Dynamics in a Multi-Port Vented Cavity Equipped with a Sinusoidal PCM-Packed Bed System

In this study, impacts of using a sinusoidal shape encapsulated phase change material (PCM) packed bed (PB) system on the phase change and thermal performance are analyzed in multi-port vented cavity under a partially active magnetic field during hybrid nanoliquid convection. The current study is performed for different magnetic field strengths of domains (Hartmann number between 0 and 50), wave number (between 1 and 8), wave amplitude (between 0.01 H and 0.15 H), and nanoparticle loading (between 0 and 2%) by using the finite element method. The sinusoidal shape of the PCM-PB zone and varying its geometrical form are both found to affect the phase change process and thermal performance. When wave amplitude (Hp) rises from 0.01 H to 0.15 H, full phase change time (t-fr) increases by about 33% while average Nu increases by about 55%. When a partially active magnetic field is imposed at the highest value, up to 30.3% reduction in t-fr is obtained, while average Nu rises by about 9% at t = 18 min. The value of t-fr is reduced by about 15% while spatial average Nu rises by about 55% at the highest nanoparticle loading.

Numerical investigation of convective cooling in a rectangular vented cavity with two inlets and a hot obstacle

The current numerical study analyzes an air-filled vented cavity of AR 1.5 with two inlets and one outlet under laminar convective flow. Rayleigh’s number is varied between 103 and 106. The inlets are located at the bottom of the vertical walls, whereas the outlet is placed in the middle of the top wall. The vertical walls are hot, and the influence of Rayleigh’s number is studied in this configuration. With each rise in Ra, the thermal recirculation increased, which increased the temperature in that region. The influence of the presence of a hot block is analyzed by placing a hot block at the center of the bottom wall. The impact of the block’s dimensionless width and depth is studied by varying each value from 0.2H to 0.8H, keeping the other perpendicular dimension as 0.3H. The flow field, thermal field, velocity components, and heat transfer rates were analyzed. The presence of a hot block creates a hydrodynamic blockage and shifts the streamlines. The findings show that when the block’s size is increased parallel to the hot wall, the heat transfer rate is higher than the other direction variation. Correlation relationships for the overall Nusselt number with other variables are attained with two power models.

Combined effects of using multiple porous cylinders and inclined magnetic field on the performance of hybrid nanoliquid forced convection

Effects of combined utilization of inclined magnetic field and multiple porous cylinders on the forced convection in a vented cavity are numerically assessed by using finite element method. Effects of Reynolds number (Re: 200–1000), magnetic field strength (Ha: 0–75), inclination of magnetic field (γ: 0–90), permeability of the porous cylinders (Da: 10−4−10−1) and size of the cylinders (R: 0.04 H–0.15 H) on the fluid flow convective heat transfer performance are studied. The presence of the cylinder and their permeability can be used for controlling the heat transfer. When cylinders at the highest permeability is used, there is 77% additional contribution to the overall thermal performance when lowest and highest Re cases are compared. There is significant contribution of the magnetic field on the suppression of the vortices in the cavity for the case with lower permeability of the cylinders. The magnetic field strength is more effective on the flow field and heat transfer as compared to its inclination. Up to 123% increment in the heat transfer is obtained at the highest strength of magnetic field for the highest permeability of the cylinders while it is only 12% when cylinders with the lowest permeability are used. When variation in the magnetic field inclination is considered, average heat transfer variation up to 19.8% is obtained for the multiple cylinders with the highest permeability. The size of the porous cylinders generally contributes positively to the overall thermal performance. Heat transfer enhancements up to 88% can be obtained by using highest cylinder size as compared to lowest size when the permeability is lowest while it is only 15% for the highest permeability case. The optimum set of parameters at Re = 200 is found as Ha, γ, Da) = (74.4, 1.3, 10−5) and at Re = 1000, it is (Ha, γ, Da) = (75, 0.35, 10−5). Significant variations in the average heat transfer is obtained when optimum case is compared with the parametric study case.

MHD hybrid nanofluid convection and phase change process in an L-shaped vented cavity equipped with an inner rotating cylinder and PCM-packed bed system

In this study, convective heat transfer and phase change process are analyzed for an L-shaped vented cavity equipped with an inner rotating cylinder and phase change material-packed bed (PCM-PB) system under magnetic field during hybrid nanofluid convection. The numerical work is performed for different values of Reynolds number (Re between 200–1000), rotational Reynolds number (Rew between −1000–1000), size of the cylinder (R between 0.05H-0.15H) and Hartmann number (Ha between 0–40) while hybrid Ag/MgO nanoparticle loading amount in water is 2%. It is observed that the vortex size and their distributions in the cavity and within the PCM-PB system can be controlled by varying rotating cylinder size and rotational speed along with the magnetic field. With higher cylinder size, phase change becomes fast while complete phase transition time (tP) is reduced by about 22% and average Nusselt number (Nu) rises by about 86% at Rew = −1000. Rotational direction of the cylinder is effective for phase transition dynamics while at Rew = −1000, tP rises up to 27% when compared to non-rotating cylinder case. Magnetic field strength is a good parameter for vortex suppression. At the highest strength, phase change becomes fast and average Nu rises up to 26.5% at Rew = −1000. ANFIS based modeling approach is used for impacts of rotating cylinder on the phase change dynamics in the L-shaped vented cavity.

Analysis of internal cooling system in a vented cavity using P, PI, PID controllers

The investigation of the problem of internal cooling system inside a vented cavity utilizing P, PI, and PID controllers are carried out in this paper. The cavity consists of an outlet, an airflow inlet, a temperature sensor, and an isothermal heat source. The remaining walls are kept at ambient temperature. A temperature probe at a central location is used to measure the internal cooling condition and hence, to control the inlet air velocity via three different types of controller arrangements. The governing Navier-Stokes and energy equations along with appropriate boundary conditions are solved using Galerkin finite element technique. Parametric simulation is conducted by considering different values of proportional (0.01, 0.05, 0.1 ms−1K−1), integral (0.1, 0.2, 0.5 ms−2K−1), and derivative (0.001, 0.0001, 0.00001 mK−1) gains for three different types of controllers. The velocity and temperature contours are used to visualize the thermo-fluid behaviors of airflow inside the cavity. Besides, non-dimensional fluid temperature of the cavity at the set point is monitored closely to determine and compare the performance of the controllers.

Analysis of mixed convection of a power-law non-Newtonian nanofluid through a vented enclosure with rotating cylinder under magnetic field

The impact of an inner adiabatic rotating cylinder within a vented cavity on the mixed convection of a hybrid nanofluid is investigated in this paper using a numerical solution. The governing equations of mixed convection motion are assumed to be two-dimensional, steady, and laminar for an incompressible power-law non-Newtonian hybrid nanofluid. Using the finite element technique, these equations are numerically solved. (Al2O3–Cu/CMC) is presented as a nanofluid in this study. The effects of significant parameters such as the Hartman number (0 < Ha < 100), cylinder radii (0.1 < R < 0.25), cylinder positions (0.25 < AR < 0.75), angular rotational speed (−10 ≤ Ω ≤ 10), Grashof number (103 ≤ Gr ≤ 105) and Reynolds number (50 ≤ Re ≤ 500) are studied. The gathered information is displayed using a variety of qualitative and quantitative numbers. The findings report that rotating the stationary cylinder counterclockwise enhances convective heat transfer, whereas rotating it clockwise has the opposite effect. Furthermore, when the cylinder is rotated counterclockwise, the heat transfer improves as the cylinder approaches the hot wall.

Buoyancy-Driven Mixed Convection and Radiation Heat Transfer in a Tilted Vented Cavity

Abstract Experimental and numerical studies have been carried out to determine the impact of tilt angle on buoyancy-driven mixed convection coupled to surface radiation heat transfer inside a vented cavity. The present investigation might be rationalized in the thermal design of the electronic equipment housing, solar collector receiver, regenerative heating/cooling system, etc. Keeping the constant ventilation size and its location, the tilt angle measured from horizontal is varied from 0 deg to 90 deg with the increment of 15 deg. The experimental investigation comprising planner symmetry is complemented with the two-dimensional numerical study incorporating the range of Rayleigh number from 7.21 × 108 to 1.75 × 109, Reynolds number from 665 to 9931, Richardson number from 20.1 to 2283.4, and the surface emissivity from 0.05 to 0.85. The results signify that the convective Nusselt number enhances significantly at the optimum tilt angle of 90 deg, whereas the moderate increment in radiative Nusselt number is found at the optimum tilt angle of 0 deg. Based on the obtained experimental data, the empirical correlations of the average convective Nusselt number and dimensionless temperature are developed in terms of Reynolds number, Richardson number, and tilt angle.

Investigation of phase change dynamics in a T-shaped multiple vented cylindrical cavity during nanofluid convection for PCM-embedded system

PurposeThe purpose of this study is to explore the phase change (PC) dynamics in a T-shaped ventilated cavity having multiple inlet and outlet ports during nanofluid convection with phase change material (PCM) packed bed-installed system.Design/Methodology/ApproachFinite element method was used to analyze the PC dynamics and phase completion time for encapsulated PCM within a vented cavity during the convection of nanoparticle loaded fluid. The study is performed for different Reynolds number of flow streams (Re1 and Re2 between 300 and 900), temperature difference (ΔT1 and ΔT2 between −5 and 10), aspect ratio of the cavity (between 0.5 and 1.5) and nanoparticle loading (between 0.02% and 0.1%).FindingsIt is observed that phase transition can be controlled by assigning different velocities and temperatures at the inlet ports of the T-shaped cavity. The PC becomes fast especially when the Re number and temperature of fluid in the port vary closer to the wall (second port). When the configurations with the lowest and highest Re number of the second port are considered up to 54.7% in reduction of complete phase transition time is obtained, while this amount is 78% when considering the lowest and highest inlet temperatures. The geometric factor which is the aspect ratio has also affected the flow field and PC dynamics. Up to 78% reduction in the phase transition time is obtained at the highest aspect ratio. Further improvements in the performance are achieved by using nanoparticles in the base fluid. The amounts in the phase transition time reduction are 8% and 10.5% at aspect ratio of 0.5 and 1.5 at the highest nanoparticle concentration.Originality/ValueThe thermofluid system and offered control mechanism for PC dynamics control can be considered for the design, optimization, further modeling and performance improvements of applications with PCM installed systems.

Influence of active flow modulation on conjugate mixed convection inside a vented cavity

The current work is an attempt to examine the performance of mixed convection heat transfer within a vented square cavity with dynamic flow modulation via a rotating heat conducting circular cylinder. External cold air is forcibly imposed through an inlet opening located at the bottom of the left wall of the cavity, while an exit port is placed at the top of the right wall. Isoflux heating is applied on the right wall, while the remaining solid wall boundaries are assumed insulated. A solid circular cylinder serving as dynamic flow modulator and rotating in counter-clockwise direction is placed near the bottom portion of the right heated wall. The governing mass, momentum, and energy equations representing the mathematical model of the present problem are solved in non-dimensional form using Galerkin finite element method. Parametric simulation is performed for wide range of governing parameters (Reynolds, Grashof, and Richardson numbers) within mixed convection regime under different dynamic conditions of the rotating cylinder characterized by the ratio of cylinder peripheral speed to mean inflow air velocity. Effects of the above governing parameters are analyzed through the visualization of streamline and isotherm plots, and the distribution of average and normalized Nusselt numbers of the heated wall, average fluid temperature in the cavity and the variation of pumping work required. Findings of the present study reveal that maximum heat transfer can be obtained by simultaneous increase of Reynolds and Grashof numbers, while careful selection of speed ratio of the rotating cylinder is necessary to obtain the optimum results within mixed convection regime. About 5.3% higher heat transfer enhancement is observed at highest speed ratio and higher Reynolds and Grashof numbers compared to the same for having stationary cylinder.

Non-uniform magnetic field effects on the phase transition dynamics for PCM-installed 3D conic cavity having ventilation ports under hybrid nanofluid convection

Effects of using non-uniform magnetic field in a PCM installed 3D vented cavity having triangular-cross section on the phase transition dynamics are numerically assessed. Alumina-copper nanoparticles are used in water as the heat transfer fluid. Numerical study is conducted for different Reynolds number (Re-between 100 and 500), Hartmann number (Ha-between 0 and 80), solid volume fraction of particles (svf-between 0.001 and 0.02), amplitude of non-uniform magnetic field (Amp-between 0.2 and 1) and aspect ratio of the cavity (AR-between 0.4 and 2). Phase transition becomes accelerated with higher Re, Ha, Amp, svf and AR. The reduction in phase transition time (tf) becomes 73% when lowest and highest Re cases are compared while by using nanoparticles at the highest amount, up to 42.9% reduction in complete transition time is obtained. For the highest amplitude of non-uniform magnetic field, 6.9% and 15% reduction amounts are obtained at Ha = 20 and Ha = 80. Faster transition times are observed with higher aspect ratio. Artificial neural networks are used for the dynamic characteristics estimations of phase change process while with 10 neuron in the hidden layer, successful estimations are obtained with network modeling approach.

Numerical investigation of turbulent forced convection flow in a two-dimensional curved surface cavity

A numerical study was carried out to investigate the thermal and flow fields of a two-dimensional vented cavity subjected to forced convection turbulent flow. The cavity with three distinct configurations of inlet and outlet ports having three different cases of top surfaces, i.e. flat, semi-elliptical and semi-circular was studied numerically for a range of Reynolds numbers. The objective of the study is to investigate the effect of the top curved wall surface on heat transfer in different configurations of inlet and outlet ports. The various results were presented for streamlines and thermal fields. The variations in the pressure-drop coefficient, local Nusselt number and average Nusselt number were also evaluated. The results show the significant dependence of heat exchange and pressure drop on Reynolds number, location of ports, and the height of the top curved wall surface. The rate of heat transfer was enhanced by increasing the height of the curved surface, but relatively high-pressure drop was observed in top curved surface cavity for the given Reynolds number. On the contrary, the semi-elliptical top surface cavity with inlet and outlet ports positioned on the same axis, displayed an improved performance in terms of maximum average Nusselt number and minimum pressure drop.

Thermal management and performance improvement by using coupled effects of magnetic field and phase change material for hybrid nanoliquid convection through a 3D vented cylindrical cavity

In this study, effects of using magnetic field and packed bed phase change material (PCM) system in a 3D cavity having ventilation ports on the performance improvements are analyzed during hybrid nanoliquid convection. Two different locations of inlet port is considered while the numerical study is conduced for various values (Reynolds number (Re, between 250 and 750), Hartmann number (Ha, between 0 and 100), size of the inlet (wd, between 0.15H and 0.85H) and nanoparticle loading amount (between 0.02% and 0.1%). When PCM is used in the vented cavity, 13% and 16.5% enhancements of average Nusselt (Nu) number are obtained as compared to no-PCM case at Ha=0 and Ha=100. A critical Ha is obtained beyond which the phase transition time (tc) is reduced and the value depends upon the inlet port location. The location of the inlet port has significant impacts on phase change dynamics and transition time. When it is closer to the wall (case-C2), tc is reduced. 65% and 80% of reductions in the tc are observed at the highest Re for configurations C1 and C2. The higher port size resulted in fast phase transition while reduction of 89% in tc is obtained at Re=750 for case C1. Nanoparticle loading accelerates the phase transition and tc is reduced by 10.4% and 9% for cases C1 and C2. However, the average Nu variation with PCM shows different behavior for cases C1 and C2. At the highest particle loading, 11% (t=52 min) and 13% (t=250 min) increments in the average Nu are achieved C1 and C2. A polynomial type correlation for tc is obtained in terms of Ha and nanoparticle amount in the heat transfer fluid.

Effects of Surface Rotation on the Phase Change Process in a 3D Complex-Shaped Cylindrical Cavity with Ventilation Ports and Installed PCM Packed Bed System during Hybrid Nanofluid Convection

The combined effects of surface rotation and using binary nanoparticles on the phase change process in a 3D complex-shaped vented cavity with ventilation ports were studied during nanofluid convection. The geometry was a double T-shaped rotating vented cavity, while hybrid nanofluid contained binary Ag–MgO nano-sized particles. One of the novelties of the study was that a vented cavity was first used with the phase change–packed bed (PC–PB) system during nanofluid convection. The PC–PB system contained a spherical-shaped, encapsulated PCM paraffin wax. The Galerkin weighted residual finite element method was used as the solution method. The computations were carried out for varying values of the Reynolds numbers (100≤Re≤500), rotational Reynolds numbers (100≤Rew≤500), size of the ports (0.1L1≤di≤0.5L1), length of the PC–PB system (0.4L1≤L0≤L1), and location of the PC–PB (0≤yp≤0.25H). In the heat transfer fluid, the nanoparticle solid volume fraction amount was taken between 0 and 0.02%. When the fluid stream (Re) and surface rotational speed increased, the phase change process became fast. Effects of surface rotation became effective for lower values of Re while at Re = 100 and Re = 500; full phase transition time (tp) was reduced by about 39.8% and 24.5%. The port size and nanoparticle addition in the base fluid had positive impacts on the phase transition, while 34.8% reduction in tp was obtained at the largest port size, though this amount was only 9.5%, with the highest nanoparticle volume fraction. The length and vertical location of the PC–PB system have impacts on the phase transition dynamics. The reduction and increment amount in the value of tp with varying location and length of the PC–PB zone became 20% and 58%. As convection in cavities with ventilation ports are relevant in many thermal energy systems, the outcomes of this study will be helpful for the initial design and optimization of many PCM-embedded systems encountered in solar power, thermal management, refrigeration, and many other systems.

Numerical investigation of convective heat transfer in a rectangular vented cavity with two outlets and cold partitions

The convective flow in a ventilated cavity having two outlets and one inlet is numerically investigated. Introducing cold partitions inside the cavity modifies heat and fluid flow characteristics. It is analyzed by placing a single and double partition inside the cavity. Three configurations of the rectangular cavity are analyzed in the laminar flow range, with Rayleigh numbers varying between 103 and 106. The Navier Stokes equation, which governs the flow, is solved using the finite difference method. The medium of flow is considered as air with Prandtl number 0.71. The result shows that the fluid entering the inlet splits into two to enter the two outlets, and this cold air occupies most of the central place of the cavity at higher Ra when there is no partition in the enclosure. With the introduction of cold sections, a part of fluid gets attracted towards it and creates fluid circulation. It decreases the velocity of the fluid at the bottom of the cavity at the midsection of outlet 2. The fluid velocity at outlet 1 is not much affected. The average heat transferred to the right wall gets significantly decreased due to the cold partitions at lower Rayleigh numbers, but there is an increase in the overall average Nusselt number of all outer walls. A correlation equation that gives the relationship between Nusselt number and Rayleigh Numbers is developed. The study presents the variation of isotherms, streamlines, velocity, rate of heat transfer and correlation of Nu for the considered problem.

Experimental and numerical study of mixed convection with surface radiation heat transfer in an air-filled ventilated cavity

The present study deals with the experimental and numerical investigation of steady combined laminar mixed convection and surface radiation heat transfer in the air-filled enclosure subjected to a constant heat flux supplied to the vent side of the cavity. Experimental results are presented for heat inputs, Q = 3.19 W–16.71 W, Reynolds number, Re = 4814–166385, and Richardson number, Ri = 0.1–25. In the present study, the numerical simulation is also performed in the two–dimensional vented cavity to enrich the experimental work for aspect ratio, A = 1–5, and surface emissivity, ε = 0.05–0.85. The momentum and energy equations under Boussinesq approximations are solved using a well-known finite-volume method, and numerical code is developed in Fortan 90 for getting all numerical results. Based on the experimental data, correlations are developed for the Nusselt number and maximum temperature of the heated surface.

Investigation of heat transfer enhancement of Cu-water nanofluid by different configurations of double rotating cylinders in a vented cavity with different inlet and outlet ports

In this study, four novel configurations of rotating cylinders in cavity with multiple ports in the presence Cu-water nanofluid are proposed. A set of case studies are conducted to analyze the effect of the main contributing factors; Reynolds numbers, Rotational Reynolds numbers, the nanofluid volume fraction, position of inlet and outlet ports, and cylinders configurations (A, B, C, and D) on the flow and heat transfer characteristics. The mean Nusselt number and Performance Evaluation Criteria (PEC) are implemented to achieve the most suitable system for various situations, as well as finding the efficiency of these configurations. The results show that increasing the nanofluid volume fraction and the rotational Reynolds number cause the mean Nusselt number and PEC to increase. Also, the results indicate that there is an optimum point, at Re = 600, which the mean Nusselt number and PEC are maximized for configuration A. Results indicate that configuration C with inlet port I1 and outlet port O1 has the highest heat transfer enhancement, while configuration C with inlet port I1 and outlet port O2 is much beneficial than the other configurations in terms of the overall PEC criteria of both cylinders.

Unsteady conjugate heat transfer with combined effects of MHD and moving conductive elliptic object in CNT-water nanofluid with ventilation ports

PurposeThe purpose of this paper is to analyze the unsteady conjugate mixed convective heat transfer characteristics in a vented porous cavity under the combined effects of moving conductive elliptic object and magnetic field.Design/methodology/approachThe finite element method and arbitrary Lagrangian-Eulerian (ALE), impacts of Reynolds number, Hartmann number, aspect ratio of the conductive ellipse and moving speed of the object on the hydro-thermal performance are analyzed.FindingsIt was observed that the dynamic characteristics of the local and average Nu number of each hot wall are different. Magnetic field strength increment resulted in the enhancement of average Nu number for bot steady and transient case while the optimum case for best hydro-thermal performance is achieved for highest Ha number and non-dimensional time of 10. Higher value of average Nu and lower pressure coefficient are achieved for aspect ratio of 4 and non-dimensional time of 10. When the moving velocity of the conductive ellipse is considered, 42% enhancement in the average Nu is obtained at non-dimensional time of 20 and object velocity equals to 0.012 times entering fluid velocity in the negative y direction while the pressure coefficient is higher. The moving object is used as a useful tool to control the dynamic features of heat transfer in a vented cavity.Originality/valueThe present method of convective heat transfer control inside a vented cavity with a moving elliptic object is novel and can be used as an effective tool with magnetic field effects owing to diverse use of convection in cavities with vented ports in many practical thermal engineering systems.

Hydrothermal index and entropy generation of a heated cylinder placed between two oppositely rotating cylinders in a vented cavity

In this work, hydrothermal behavior and entropy generation of a heated cylinder placed between two oppositely rotating cylinders inside a vented cavity is studied numerically using the finite volume technique. The mixed convection of a steady, 2D, and laminar flow is considered for the flow through the vented cavity. For counter-rotating cylinders, according to the center of the heated cylinder, two different vertical distances, Zy and three different horizontal distances, Zx are investigated with angular rotational speeds, Ω ranging from 0 to 15. The influence of relevant parameters on hydrothermal behavior, such as Reynolds number (100 ≤ Re ≤ 500) and Grashof number (103 ≤ Gr ≤ 106) is taken into account throughout the simulations. The numerical results are exposed in terms of various qualitative and quantitative figures. Regardless of the position of counter-rotating cylinders, results show that the optimal thermal performance criterion, ξ is achieved at low Reynolds number (Re=100) over the ranges of angular rotational speeds, Ω.

Mixed convection flow of hybrid nanofluid through a vented enclosure with an inner rotating cylinder

A numerical solution for the influence of an inner adiabatic rotating cylinder inside a vented cavity on mixed convection of hybrid nanofluid is presented in this study. The governing equations of mixed convection flow for an incompressible Newtonian hybrid nanofluid are assumed to be two-dimensional, steady, and laminar. These equations are solved numerically by using the finite volume technique. In this work, (Al2O3 –Cu/ water) is introduced as a hybrid nanofluid. The influences of relevant parameters including nanoparticle concentrations (0 ≤ φ1 ≤ 0.02 and 0 ≤ φ2 ≤ 0.02), cylinder radiuses (0.1 ≤ R ≤ 0.3), cylinder locations (0.25 ≤ δ ≤ 0.75), angular rotational speeds (−5 ≤ Ω ≤ 5), Grashof numbers (103 ≤ Gr ≤ 105) and Reynolds numbers (50 ≤ Re ≤ 500) are examined. The obtained data are exhibited by means of different qualitative and quantitative figures. The results show that the energy transport of hybrid nanofluid enhances with an increase in solid particle concentration, but it is associated with an increased pressure drop. With respect to the stationary cylinder, it is reported that the counter-clockwise cylinder rotation increases convective heat transfer whereas the clockwise direction has a reverse effect. In addition, for the counter-clockwise rotation of the cylinder, the heat transfer enhances when the position of the cylinder approaches the hot wall. The maximum heat transfer enhancement over the stationary cylinder with 21% occurs in case of R = 0.3 and δ = 0.5 under Gr = 104, φ1 = φ2 = 0.02, Re = 100 and Ω =5. The current study can provide useful guidelines to the designers of rotary heat exchangers.