Stainless Steel Wool Research Articles

Metal-Catalyzed Thermo-Catalytic Decomposition and Continuous Catalyst Generation

In this study, metal dusting is utilized to initiate a two-stage thermo-catalytic decomposition (TCD) process. Stage 1 starts with metal-catalyzed TCD, and in stage 2 the metal-catalyzed carbon catalyzes additional TCD. TEM is presented of the early- versus late-stage TCD to qualitatively illustrate the second-stage TCD by the metal-catalyzed carbons. Corresponding SEM illustrates differences in growth type and surface density between early versus late reaction times, with backscattered imaging differentiating the first- versus second-stage TCD. TGA supports the microscopic inference of a second carbon phase by the presence of an early (low-temperature) reaction peak, characteristic of low-structure or disordered carbon as the second-stage TCD carbon. Raman analysis confirms that the second-stage carbon deposit is more disordered and unstructured, especially at 1000 °C, supported by the ID/IG and La value changes from 0.068 to 0.936 and 65 nm to 4.7 nm, respectively. To further confirm second-stage TCD occurrence upon pre-catalyzed carbons, two carbon blacks are tested. Exposing a combination of edge and basal or exclusively basal sites for the graphitized form, they afford a direct comparison of TCD carbon nanostructure dependence upon the initial carbon catalyst nanostructure. Pre-oxidation of the stainless-steel wool (SSW) prior to TCD is advantageous, accelerating TCD rates and increasing carbon yield relative to the nascent SSW for an equivalent reaction duration.

Enhancing bioelectrochemical hydrogen production from industrial wastewater using Ni-foam cathodes in a microbial electrolysis cell pilot plant

Microbial electrolysis cells (MECs) have garnered significant attention as a promising solution for industrial wastewater treatment, enabling the simultaneous degradation of organic compounds and biohydrogen production. Developing efficient and cost-effective cathodes to drive the hydrogen evolution reaction is central to the success of MECs as a sustainable technology. While numerous lab-scale experiments have been conducted to investigate different cathode materials, the transition to pilot-scale applications remains limited, leaving the actual performance of these scaled-up cathodes largely unknown. In this study, nickel-foam and stainless-steel wool cathodes were employed as catalysts to critically assess hydrogen production in a 150 L MEC pilot plant treating sugar-based industrial wastewater. Continuous hydrogen production was achieved in the reactor for more than 80 days, with a maximum COD removal efficiency of 40 %. Nickel-foam cathodes significantly enhanced hydrogen production and energy efficiency at non-limiting substrate concentration, yielding the maximum hydrogen production ever reported at pilot-scale (19.07 ± 0.46 L H2 m−2 d−1 and 0.21 ± 0.01 m3 m−3 d−1). This is a 3.0-fold improve in hydrogen production compared to the previous stainless-steel wool cathode. On the other hand, the higher price of Ni-foam compared to stainless-steel should also be considered, which may constrain its use in real applications. By carefully analysing the energy balance of the system, this study demonstrates that MECs have the potential to be net energy producers, in addition to effectively oxidize organic matter in wastewater. While higher applied potentials led to increased energy requirements, they also resulted in enhanced hydrogen production. For our system, a conservative applied potential range from 0.9 to 1.0 V was found to be optimal. Finally, the microbial community established on the anode was found to be a syntrophic consortium of exoelectrogenic and fermentative bacteria, predominantly Geobacter and Bacteroides, which appeared to be well-suited to transform complex organic matter into hydrogen.

Effect of particle size on the capture of uranium oxide colloidal particles from aqueous suspensions via high-gradient magnetic filtration

The effectiveness of High Gradient Magnetic Filtration (HGMF) in capturing uranium oxide particles from suspensions was investigated in this study. Two sets of experiments were performed to evaluate the importance of size on the capture of uranium oxide particles. The first considered two batches sieved into size bins of< 5, 5–10, 10–15, and 15–20 µm, while the second was performed using two suspensions with diameters smaller than 1.0 µm and between 1.0 and 1.5 µm. Iron oxide experiments, with particles between 0.3 and 0.8 µm, were performed for calibration purposes. In all experiments, a surfactant (Triton-X100 or sodium dodecyl sulfate) was used to prevent particle aggregation and limit the influence of non-magnetic capture mechanisms. A magnetic field of approximately 1.1 Tesla was generated using a water cooled electromagnet. HGMF was performed using tubular filters packed with ferromagnetic stainless-steel wool. Of the initial four uranium oxide particle sizes, magnetic capture was only observed for particles with a diameter of less than 5 µm, while larger particles experienced no magnetic and minimal total capture. For particles with diameters smaller than 1.0 µm and between 1.0 and 1.5 µm, capture efficiencies increased by 39 ± 9% and 34 ± 6% respectively, solely due to the magnetic field. Although the magnetic force is proportional to particle diameter, the capture efficiency decreased as diameter increased. These results suggest that Brownian diffusion, which is influential for micron sized particles and increases with decreasing particle size, is acting in conjunction with the magnetic force to influence the efficacy of HGMF for uranium oxide. This important finding underscores the effectiveness of Brownian diffusion in increasing the rate of collision between particles and collector fibers. A stochastic trajectory model was developed to incorporate the influence of Brownian motion on particle behavior and filter removal efficiency. Modeling results are discussed and compared for uranium and iron oxide particles.

Stainless steel wool as novel bioanode for microbial electrolysis cells: A systematic study of materials

In the last years, microbial electrochemical technologies have received increasing attention due to their promising environmental potential. However, the identification of the most suitable materials for further development of these technologies tends to be challenging, especially for operation under realistic wastewater conditions. The objective of the present work is to carry out a systematic comparison of six anode materials (stainless-steel wool, carbon paper, graphite felt, graphite plate, graphite foil, and stainless-steel mesh) for microbial electrolysis cells operated for the treatment of brewery wastewater and determine the best material of these in sight of its electrochemical performance. For this purpose, the medium was semisynthetic brewery wastewater of low buffer capacity and low conductivity. The results suggest, that the degree of fermentation and characteristics of the studied media have only a minor impact on the limiting current density of the bioanodes. Here, the limiting current density of microbial anodes with stainless-steel wool (0.45 ± 0.07 mA·cm−2), a not so extensively studied promising material, outperformed commonly used materials such as graphite felt, without evidence of corrosion.

Enhancing the Power Conversion of Photovoltaic Systems with Metallic Porous Media and Phase Change Material

Photovoltaic system is one of the promising electricity generation devices due to its direct solar energy conversion, safe power transmission and practicability. However, its performance is very sensitive to higher temperatures. Photovoltaic/Thermal systems were presented for enhancing the electrical efficiency and making use of the lost thermal energy. In this research, a combined usage of Paraffin as a phase change material and a stainless-steel porous media was used to decrease its temperature and make use of it. Two different systems were used for comparison. One contains Stainless steel wool with paraffin, and the other with only Paraffin. Three flow rates of 0.2, 0.3, and 0.4 LPM were used of water as a circulating and cooling fluid. It was found that, for all the flow rates, the system with a porous metallic media achieved lower surface temperature, higher electrical efficiency, and higher overall efficiency. The temperature of the PV cell decreased by from 5 to 25⁰ C. The enhancement achieved was from 10% to 28% in the overall efficiency, and 1% to 4% in the electrical efficiency. This proves the importance of the porous metallic media in enhancing properties of the phase change materials when using with the Photovoltaic modules cooling.

Experimental parametric passive solar desalination prototype analysis

Passive solar desalination is a simple system that is convenient for use in arid areas. In this paper, an experimental investigation with a theoretical parametric analysis was performed for a passive solar desalination system composed of an evacuated tube collector integrated with a steel condenser. The impacts of the porosity of the stainless-steel wool in the evaporation section and the radiation shading for the condenser were examined. It was found that the less porosity of the stainless-steel wool achieves an overall efficiency enhancement of 5% compared to the maximum porosity. The condenser's shading achieved an overall efficiency enhancement of 12.4%, compared to the unshaded condenser's case. The theoretical analysis showed that the condensate increases with the increase of both ambient temperature and global solar irradiance, while decreases with the increase of wind speed. The theoretical model was validated with the experimental shading case with maximum error of 8.6% in the overall efficiency. The cost of the produced desalinated water reached 0.01287 $/kg/m2 in the proposed system.

Thermal Investigations of Double Pass Solar Air Heater with Two Types of Porous Media of Different Thermal Conductivity

This study describes an experimental investigation of the thermal efficiency of stainless steel mesh and steel wool as a porous medium in the lower channel of a double pass solar air heater. An experimental setup was planned and developed. Various types of porous media with high thermal conductivity and with different porosities have been tested. The effects of the porosity of wire mesh, the thermal conductivity of porous media, mass flow rate, and the intensity of radiation have been studied. Experimental results show that thermal efficiency with using porous media is greater than without using porous media. When used steel wool as a porous medium, the thermal efficiency reached 79.82 percent while it can be achieved 76. The percent by using stainless mesh as porous material. The reduction in porosity increasing thermal efficiency. The thermal efficiency of multi-pass solar air collector when used steel wool as porous media is 6, 12.6 and31.7percent higher than without porous media at porosity 98.75, 97.5, and 96.25percent. While it can increase 8.1 and 28.5 percent at porosity 97.875 and 95.75 percent when using stainless steel as porous media.

An assessment on how different collection methods impact thermal properties, surface functional groups, nanostructure and morphology of diesel particulate matter

Abstract This work assessed the effect of gathering particulate matter from the exhaust of an automotive diesel engine through: a vacuum pump using Teflon filters; a particle trap with stainless-steel wools; a thermophoretic probe with Lacey-carbon TEM grids, and a partial dilution mini tunnel with fiberglass filters, on PM thermal behavior (TGA), chemical functional groups on PM surface (FTIR), and nanostructure (Raman, XRD, HRTEM and TEM). Results showed that for TGA, particulate trap was the most suitable method. The degree of compactness of PM samples gathered with vacuum pump, affected thermogravimetric analysis. The significant uncertainties induced by PM sample preparation from mini tunnel make it unsuitable for TGA. FTIR results revealed that PM samples collected with vacuum pump were the most suitable method to analyze functional groups. PM from particulate trap was passive partially oxidized due to long collection times as evidenced by the 1640 cm−1 wavelength peak. Given that particulate trap method provides a large amount of PM sample, it would be recommendable to shorten enough collection time to avoid PM passive oxidation. Particulate trap and vacuum pump methods showed similar Raman and XRD results. Mini tunnel samples exhibited significantly higher AD3/AG and AD4/AG peaks due to filter fluorescence, which besides induced interference in XRD analysis. Particulate trap samples exhibited a pronounced peak in 2θ = 43° corresponding to stainless-steel contamination. Although it did not affect the lattice parameters from XRD, HRTEM was more suitable for nanostructural characterization. Particles gathered by thermophoretic probe do not require additional post-treatment, making this more suitable for nanostructural and fractal analysis. Results revealed that using a unique collection method may induce significant uncertainties depending on the PM specific property to be analyzed. It was found that a combination of particulate trap and thermophoretic probe methods would be suitable for PM thermal and nanostructural characterization.

Optimization and Modelling of Turbidity Removal of Sewage using High-Gradient Magnetic Separation (HGMS) by Response Surface Methodology (RSM)

Endless industrial development and growing society occasionally create an enormous volume of wastewater, which leads to some issues on wastewater treatment. Existing conventional screening processes have various limitations and drawbacks. Therefore, this study investigated the use of a combination of non-corrosive stainless steel wool and a permanent magnet to increase magnetic gradient, hence reducing suspended matter in sewage through turbidity test. An approach for optimizing the reduction of suspended matter through turbidity analysis was conducted using central composite design (CCD) under response surface methodology (RSM). Three critical independent variables, such as magnet strength, circulation time, and steel wool, and turbidity removal as the response, were further studied to analyze their interaction effects. As a result, an optimal value of turbidity removal was found at 90.3% under the specified optimum conditions of magnet strength of 245 mT, 116 g of non-corrosive stainless steel wool, and 16 h of circulation time. Statistical analysis had shown that the magnet strength, circulation time, and steel wool significantly affected the turbidity removal performance. Furthermore, design of experiment was significantly verified by a small range of error between predicted and actual data. Consequently, a higher gradient of magnetic separation was proven to effectively remove suspended matter using inexpensive non-corrosive stainless steel wool without using magnetic adsorbent. Thus, the suggested approach was found to be cost-effective and environmentally friendly for sewage treatment.

Prediction of Heat Transfer in Reciprocating Antifreeze Flow Through a Porous Filter

Heat transfer to an oscillating vertical annular flow through a porous material is investigated experimentally. The flow media includes stationary stainless steel wool filter and monoethylene glycol (which is known as a coolant, heat transfer agent or antifreeze) as the working fluid. Reciprocating forced oscillations are imposed on the single-phase monoethylene glycol via a frequency controlled dc motor and a piston-cylinder device where displacement amplitude is kept constant. Electrical heater occupies the inner section of the vertical annulus which provides constant heat flux. The analysis is carried out for two different heat fluxes and for five different frequencies and the effect of these on the temperature field and resultant heat convection coefficient are studied. A cycle and space averaged Nusselt number correlation is fitted which is useful in predicting rate of heat transfer from oscillating flows through highly porous and permeable solid media (such as in filters) at low actuation frequencies and at low heat flux rates. Developed correlation equation is validated for monoethylene glycol, glycerol and water. Oscillatory antifreeze flow in porous filter is proposed as a remedy for the limited thermal conductivity of the water-monoethylene glycol solution. These results also have possible applications in fluid pumping technology in converting of low-grade thermal energy to pumping work.

Magnetic nanoparticle recovery device (MagNERD) enables application of iron oxide nanoparticles for water treatment

An optimized permanent magnetic nanoparticle recovery device (i.e., the MagNERD) was developed and operated to separate, capture, and reuse superparamagnetic Fe3O4 from treated water in-line under continuous flow conditions. Experimental data and computational modeling demonstrate how the MagNERD’s efficiency to recover nanoparticles depends upon reactor configuration, including the integration of stainless-steel wool around permanent magnets, hydraulic flow conditions, and magnetic NP uptake. The MagNERD efficiently removes Fe3O4 in the form of a nanopowder, up to > 95% at high concentrations (500 ppm), under scalable and process-relevant flow rates (1 L/min through a 1.11-L MagNERD reactor), and in varying water matrices (e.g., ultrapure water, brackish water). The captured nanoparticles were recoverable from the device using a simple hydraulic backwashing protocol. Additionally, the MagNERD removed ≥ 94% of arsenic-bound Fe3O4, after contacting As-containing simulated drinking water with the nanopowder. The MagNERD emerges as an efficient, versatile, and robust system that will enable the use of magnetic nanoparticles in larger scale water treatment applications.

Performance Evaluation of a Refrigeration System for Fresh Maize Storage

Aims: In this research project, a refrigeration system that will preserve the quality of fresh maize was developed.&#x0D; Study Design: Design of refrigeration system.&#x0D; Place and Duration of Study: Department of Industrial and Production Engineering, Federal University of Technology, Akure, Ondo State, Nigeria, between August 2017 and February 2018.&#x0D; Methodology: The designed system consists of a cooling cabinet, compressor, condenser and an evaporator. The cabinet was designed to store up to 15 kg of maize and a compressor of 1/6 hp was used. The equivalent condenser and evaporator were selected with an equivalent expansion valve. R134a was used as the refrigerant. The cabinet walls were fabricated from mild steel (outside wall), stainless steel (inner wall) and glass wool (insulator).&#x0D; Results: The fabricated system stores fresh maize above its freezing temperature of -1ºC. The system operating temperature ranges from -4 to 2.5ºC with a relative humidity of 90 to 95% for eight hours.&#x0D; Conclusion: The fresh maize was stored for ten days without noticeable changes in the physical appearance and taste of the maize.

Electrochemical water softening: Influence of water composition on the precipitation behaviour

Hardness in membrane concentrates implies lower water recoveries in desalination. Electrochemical water softening is considered as a possible solution to control this hardness. This technique is based on the electrochemically forced precipitation of insoluble compounds of hardness ions onto the cathode surface. In this work we studied, in practical conditions, the effect of water composition on the technique efficiency and on the properties of the electroprecipitates. Experiments were conducted with a filter-press reactor and a 3D stainless steel wool cathode and for waters of a fixed hardness but varying the following composition parameters between them: alkalinity, Mg/Ca relationship and presence of an anti-scalant compound. Precipitates were fully characterised by SEM, XRD, TG-DTA and N2 adsorption. Efficiency was measured in terms of hardness removal, demonstrating that the technique removes Ca more efficiently than Mg and that the presence of an anti-scalant does not alter the results. The properties of the electroprecipitates (morphology, texture, porosity and components) were related to water composition, evidencing its relevant effect. Geochemical modeling was realised to explain the electroprecipitation behaviour and why calcite, aragonite, vaterite and brucite are the only phases detected. This information contributes to the technique development, necessary for a future application in desalination practice.

Electrochemical softening of concentrates from an electrodialysis brackish water desalination plant: Efficiency enhancement using a three-dimensional cathode

Abstract The electrochemical softening method to remove hardness from water has not been applied in desalination practice due to a high cathodic area requirement. In this work, the use of a 3D stainless steel wool cathode is proposed to overcome this technical limitation. An extensive comparison between the 3D cathode and a 2D Ti mesh has been presented, showing higher hardness removal for the 3D one. Experiments have been conducted with waters similar to concentrates derived from a brackish water treatment by electrodialysis. In addition, the method has been proved to be efficient for different water compositions in terms of hardness, alkalinity or the presence of an anti-scalant. The main influencing parameters (flow rate and current density) have been studied and it can be concluded that lower flow rates (below 1.2 L h−1) give rise to a better efficiencies and 100 A m−2 is the optimum current density. Moreover, the precipitate was characterised by SEM, EDX and XRD showing that Ca2+ is removed as calcite and aragonite (CaCO3), whereas Mg2+ is precipitated as brucite (Mg(OH)2). Finally, long-term experiments revealed that the 3D stainless steel cathode has a better performance than the 2D Ti mesh, but only at short times.

Low-cost stainless-steel wool anodes modified with polyaniline and polypyrrole for high-performance microbial fuel cells

A conducting polymer coated stainless-steel wool (SS-W) is proposed for use as a low-cost anode for microbial fuel cells (MFCs). When coated with polyaniline (PANi) and polypyrrole (PPy), the pristine SS-W, SS/PANi-W and SS/PPy-W anodes produced maximum current densities of 0.30 ± 0.04, 0.67 ± 0.05, 0.56 ± 0.07 mA cm−2, respectively, in air-cathode MFCs. Also, based on achieved power density, both SS/PANi-W and SS/PPy-W achieved 0.288 ± 0.036 mW cm−2 and 0.187 ± 0.017 mW cm−2, respectively, which were superior to 0.127 ± 0.011 mW cm−2 obtained with pristine SS-W. Further, in comparison with SS-P based anodes, all SS-W based anodes gave improved power densities under similar experimental conditions by at least 70%. Moreover, the charge transfer resistance of the SS-W was much lower (240 ± 25 Ω cm−2) than for the SS-P (3192 ± 239 Ω cm−2). The j0(apparent) values obtained for SS/PANi-W (0.098 ± 0.007 mA cm−2) and SS/PPy-W (0.036 ± 0.004 mA cm−2) anodes were also much higher than that of the pristine SS-W (0.020 ± 0.005 mA cm−2), as well as than those of all SS-P based anodes. The observed enhancement of the bioelectrocatalytic performances were well supported by physicochemical and electrochemical characterisation.

Design, optimization and layout of a compact cold trap with high efficient heat recovery by a helical coil for the Karlsruhe Sodium Laboratory

Three conceptual designs of a cold trap with integrated sodium-air HX (heat exchanger) and sodium-sodium HR (heat recuperator) were considered for the KASOLA (KArlsruhe SOdium LAboratory) sodium loop in Karlsruhe, Germany. All designs consist in the bottom part of vertically placed stainless steel wool packages used to retain the impurities from sodium. The upper part contains the sodium-air HX and the sodium-sodium HR. The purification function of the cold traps was laid out so that it can serve for the complete service life time of the experimental facility quasi maintenance-free. Regarding the sodium cooling and the heat recuperation three designs have been proposed and analyzed, and the best solution has been chosen. The study is focused on the layout and the optimization of the cold trap with respect to the optimal wire mesh dimensioning (e.g. wire mesh radial size, sodium residence time, pressure loss, etc.), optimal solution for the sodium heat recovery and for the air cooling system. The final design chosen has efficient sodium purification, larger purification rate, heat recovery of up to ∼90% and low operating costs. This optimized design was further fine tuned and the cold trap was manufactured and installed in the KASOLA facility.

Numerical optimization of cold trap designs for the Karlsruhe Sodium Laboratory

The present study is focused on the numerical analysis of three designs (basic, intermediate and optimized) for the cold trap considered for sodium purification in the KASOLA (KArlsruhe SOdium LAboratory) sodium loop. Given the complexity of the construction the present approach was based on CFD (Computational Fluid Dynamics). The comparison of the designs considered reveals that significant improvements have been obtained regarding the cooling and heat recovery systems. The CFD (Computational Fluid Dynamics) models considered a conjugate heat transfer approach in order to simulate both fluids (air and sodium) and the solid domains (stainless steel walls). The stainless steel wool packages were numerically modelled using a porous domain. For most of the cases the air flow is turbulent and was modelled using the Shear Stress Transport (SST) turbulence model, while the sodium flow was treated as laminar or turbulent, depending on the sodium flow rate. The effect of the turbulent Prandtl number and of the turbulence models (SST and Reynolds-stress models) on the heat transfer has been also investigated. The influence of the buoyancy forces has been also studied. The numerical results are found in very good agreement with the thermal balance analysis of the cold traps. The pressure loss for all designs is similar, nevertheless with a minor improvement for the optimized design. The study compares the advantages of each design and based on this analysis a design was identified and used for the cold trap that was manufactured and installed in the KASOLA facility.

Application of high gradient magnetic separation for oil remediation using polymer-coated magnetic nanoparticles

Abstract Oil can be released into the environment from different sources such as runoff, accidental oil spills and oily wastewater discharges produced during industrial activities and can have dramatic impacts on the environment. The limitations of current clean-up techniques have inspired researchers to study the application of nanotechnology for oil remediation. Previously, we reported excellent oil-removal efficiency of a reference MC252 oil using polyvinylpyrrolidone (PVP)-coated magnetic nanoparticles (NPs) from an oil-water mixture under a wide range of environmentally relevant conditions. In the current report, the same type of NPs were used with a high gradient magnetic separation (HGMS) technique for the rapid removal of oil from oil-water mixtures in a continuous flow system. Using a high magnetic field (0.56 T) and 1 h mixing time, fluorescence and inductively coupled plasma-optical emission spectrometer (ICP-OES) data showed approximately 85–95% oil and NP removal under all conditions. Gas chromatography–mass spectrometry (GC–MS) results show 88 and near 100% removal of alkanes (C9-C22) for experiments in the presence or absence of stainless steel wool, respectively. Continuous use over 7 h of operation (17 L oil-water mixture was treated) showed no reduction in oil and NP removal capacity. Results showed that increasing the magnetic field and inserting stainless steel wool significantly increased oil and NP removal efficiencies. This study shows that using HGMS is a promising technique for oil remediation using PVP-coated magnetic NPs.

Experimental development of a Nusselt correlation for forced reciprocating oscillated vertical annular glycerol flow through a porous domain

The objective of this paper is to investigate the heat transfer to oscillating annular flow of a viscous fluid. The flow media includes stationary stainless steel wool porous domain and glycerol as the working fluid. The effects of actuation frequency and wall heat flux on the temperature field and resultant heat convection coefficient are studied. The temperature values at radial direction are close each other as porous media mixes the glycerol successfully. A correlation with a functional dependence to kinetic Reynolds number is recommended that can be used to acquire the averaged heat transfer for oscillating flows. Present experimental results with glycerol in a porous media are compared to the published experimental works with water. For the limited case of the two working fluids, Nusselt number is normalized well using the Prandtl number (Pr0.67). Results are also compared to non-porous media study and heat transfer is found to increase up to a factor of five in porous media. The recommended correlation is claimed to have a significant role for anticipating heat transfer of oscillating viscous fluid not only at low frequencies but also at low heat fluxes in a porous and permeable solid media.

Nusselt correlation to predict heat transfer from an oscillated vertical annular fluid column through a porous domain

Experimental evaluation of the heat transfer in oscillating flow under the constant heat flux and constant amplitude fluid displacement conditions is presented for a vertical annular flow through a stainless steel wool porous media. The analysis is carried out for two different heat fluxes and for five different frequencies. The data is acquired from the measurements both in the initial transient period and in the pseudo-steady (cyclic) period by the system. The physical and mathematical behavior of the resulting Nusselt numbers are analyzed, according to data acquired from the experiments and in accordance with the results of the Buckingham Pi theorem. A cycle and space averaged Nusselt number correlation is suggested as a function of kinetic Reynolds number for oscillating flows. The suggested correlation is useful in predicting heat transfer from oscillating flows through highly porous and permeable solid media at low actuation frequencies and at low heat fluxes applied in the wall. The validity of the Nusselt numbers acquired by correlation is discussed using experimental Nusselt numbers for the selected kinetic Reynolds number interval. The present investigation has possible applications in moderate sized wicked heat pipes, solid matrix compact heat exchangers compromising of metallic foams, filtration equipment, and steam generators.