Helical Tape Research Articles

Experimental analysis of W/EG based Al2O3-MWCNT non-Newtonian hybrid nanofluid by employing helical tape inserts inside a corrugated tube

Experimental analyses have been undertaken on friction factors and convective heat transfer using a helically corrugated tube (HCT) equipped with inserts, under laminar flow conditions. Water-ethylene glycol mixture with Al2O3-MWCNT hybrid nanofluids has been employed. The investigation focused on examining the synergistic effects of hybrid nanofluids, triangularly helical tape (THT) inserts and helical corrugation within the tubes on the friction factor, Nusselt number, and thermal performance factor (TPF). The fluid displayed non-Newtonian behaviour at volume fractions greater than 0.1 %. The study indicated that augmenting the concentration of Al2O3-MWCNT in the hybrid nanofluid and decreasing the helix ratio of the THT inserts led to increased heat transfer rates and TPF. The peak TPF of 2.31 was recorded when using the W/EG based Al2O3-MWCNT hybrid nanofluid with a 1 % volume fraction in an HCT equipped with THT inserts with a helix ratio of 2 at a Reynolds number of 2000. Moreover, Al2O3-MWCNT exhibits an average Nusselt number of 42.5 %, 49.47 %, and 56.2 % higher than the base fluid at φ = 0.1 %, 0.5 %, and 1 %, respectively.

Multi-objective optimization and thermodynamic assessment of a solar unit with a novel tube shape equipped with a helical tape

The performance of several heat transfer mechanisms, including solar energy sources, is being improved through optimization, which also effectively supports the most efficient feasible design. A numerical study has been done on a turbulator-enhanced flat plate solar collector (FPSC) while also introducing the utilization of a quad-lobed tube as a pioneering innovation in the system’s design. The incorporation of nanoparticles into the working fluid was implemented to enhance performance, with aluminum oxide particles selected for this purpose. Furthermore, assessing the second law and analyzing exergy generation was employed to discern irreversibility within the system. Optimization of both geometric and non-geometric elements has been accomplished through the integration of a multi-objective optimization (MOO) method with machine learning (ML). Random Forest (RF), LASSO Regression (LaR), and Support Vector Regression (SVR) are the machine learning models that were utilized in order to ascertain the correlations that exist between the system’s inputs and outputs. According to the findings, RF was found to be the most appropriate algorithm for capturing the impacts of parameter variations. This was demonstrated by the high coefficient of determination (R2) quantities that RF possessed, which were 0.95, 0.99, and 0.99 for friction factor (f), exergy loss (Xd), and second law effectiveness (ηII), respectively. However, the SVR and LaR algorithms showed significant deviations from the FPSC simulation results. The SVR algorithm achieved R2 values of 0.54 for f, 0.78 for Xd, and 0.84 for ηII, while the LaR algorithm achieved R2 values of 0.65 for f, 0.99 for Xd, and 0.98 for ηII. This research aims to find the optimal input parameters that minimize f and Xd while maximizing ηII. Therefore, to determine the Pareto optimal solutions the non-dominated sorting genetic algorithm (NSGA-II) has been utilized. The result was an illustration of the Pareto set, which stands for a collection of optimal solutions. Every solution in this collection achieved the desiredbalance, obtaining the best outcomes without compromising any objectives.

Twisted helical Tape's impact on heat transfer and friction in zinc oxide (ZnO) nanofluids for solar water heaters: Biomedical insight

This study explores the influence of Zinc Oxide (ZnO) nanofluids on solar water heaters with Dimple Tubes and Helical Twisted Tape (DTHTT) surfaces. The helical twisted tape design enhances turbulence, improving nanofluid mixing and thermal exchange. Computational fluid dynamics (CFD) validates the efficiency of the parabolic trough solar water heater (PTSWH) with emphasis on solar light concentration and feed water flow velocity. Optimal conditions include a 0.3% ZnO nanofluid volume concentration, mass flow rates between 1.0 kg/min and 5.0 kg/min, and copper-type twisted helical tapes. Experimental results reveal Nusselt number enhancements of 15.1% and 20.96% at H/D = 10, and 16.72% and 32.12% at H/D = 3, for 0.3% ZnO nanofluid, at Reynolds numbers from 3000 to 8000. The twisted tape arrangement at H/D = 3 exhibits increased fluid mixing, leading to higher convective heat transfer. Friction factor enhancements at Reynolds numbers 3000 and 8000 are 0.26% and 0.38%, respectively, compared to the base fluid. At a 3.0 kg/min mass flow rate, thermal efficiency increases to 39.25%, a 13.25% gain over plain tapes. The model shows a ±3.24% deviation from the expected friction factor, with a total ±1.2% discrepancy between experimental and simulated findings, remaining within an acceptable range.

Numerical simulation and irreversibility analysis of nanofluid flow within a solar absorber duct equipped with a novel turbulator

This research presents an innovative alteration to the solar collector's design by integrating a 4-lobed tube with helical tape. The choice of a working fluid, a combination of water and alumina nanoparticles, is purposeful, aiming to reduce irreversibility. Extensive numerical simulations, along with thorough benchmark verification, meticulously assess the system's performance, demonstrating strong alignment with established benchmarks.This study delves into the interaction among pivotal parameters—D* (diameter ratio), Re (Reynolds number), and N (revolution number)—and their impact on essential performance metrics, encompassing ηII (second law performance), Xd (exergy drop), and Φx (exergy drop ratio). With the elevation of all three parameters, the intensified swirl flow facilitates improved heat absorption by the nanofluid, resulting in reduced entropy generation and subsequently, a decrease in exergy drop. More precisely, the increments in Re, N, and D* lead to significant reductions in the value of Xd, with approximately 52.1 %, 4.02 %, and 5.03 %, respectively. When N = 4, D*=0.02, the amount of ηII for Re = 2e4 is 8.38 times greater than that of Re = 4e3. Increasing D* and N leads to substantial improvements in ηII, with approximately 50.02 % and 30.15 % enhancements, respectively. The highest ηII, reaching 0.582, is attained when D*=0.048, N = 7, and Re = 2e4.

Enhancing heat transfer performance in a double tube heat exchanger: Experimental study with twisted and helical tapes

Efficient energy exchange is vital for designing compact and effective heat exchangers. This study investigates various twist ratios for tape inserts and exterior helical tape in a counterflow setup using water as the working fluid. Reynolds numbers are varied on both sides of the heat exchanger. The analysis reveals that incorporating twisted tape inserts inside the pipe, along with helical tape on the exterior, significantly enhances thermal characteristics. Compared to a plain pipe heat exchanger, Nusselt numbers increase by 219 %–315 % for the pipe with twisted tape inserts and helical tape. Friction factors are also higher, ranging from 4.4 to 8.7 times for pipe inserts with twist ratios of 6.77, 4.51, and 3.38. An empirical relationship between Nusselt number and friction factor is derived from experimental data, demonstrating remarkable agreement with predicted values. A maximum thermal performance factor (TPF) of 3.06 is achieved, emphasizing the critical role of twist ratios in optimizing heat transfer efficiency while minimizing energy consumption. These findings provide valuable insights for designing energy-efficient heat exchangers with enhanced heat transfer rates.

Numerical simulation of the hydrodynamics in a novel jet loop bubble column with helical sieve tapes

Hydrodynamics and mixing in a novel down-flow jet loop reactor (DFJLR) with an internal helical sieve tape (HST) were studied by computational fluid dynamics (CFD) simulations. A helical sieve tape inside the draft tube caused a significant portion of the gas bubbles to flow helically, which increased radial mixing, overall gas holdup, axial liquid velocity, and turbulent kinetic energy. Compared with a similar reactor without a helical sieve tape, the gas holdup in reactors with a helical tape or a helical sieve tape inside the draft tube was increased, respectively, by 50 % and 75 %. A helical sieve tape with an area ratio of 27 % and helical pitch length of 492 mm was efficient in increasing gas holdup while keeping a lower pressure drop. Data and designs presented in this work will give insight and further understanding for reactor scale-up as a function of geometry and flow patterns for industrial applications.

Heat transfer improvement of hybrid nanofluid with use of twisted tapes within a heat exchanger

Influence of utilizing porous zone on behavior of hybrid nanofluid through a duct was scrutinized by applying of FVM approach. Darcy model in three dimensional steady flow forms has been applied and related terms have been incorporated in momentum equations. Mixture of nanoparticles (MWCNT + Al2O3) and H2O creates hybrid nanofluids which were utilized as testing fluid. To improve the absorbing heat, helical tape was incorporated. The test section of duct is middle 40 cm of the duct where the porous zone and helical tapes were mounted. Validation base of previous published work and studying the grid leads to the most accurate outputs with lowest computing price. Impacts of Da, ϕ and Re on treatment of working fluid have been examined. Selecting greater amounts of ϕ and Re makes Nu intensify by 7.27% and 35.58%. As permeability of zone increases, fluid can moves faster along the axial direction and Nu declines about 6.78%.

Thermal improvement of heat exchanger with involve of swirl flow device utilizing nanomaterial

The main objective of this article is to increase the flow mixing within a tube; in this regard, the helical tape with external inserts was developed and studied. CuO based nanofluids was used as a working fluid, and a novel testing fluid model was based on the previous empirical formulation by a three-dimensional (3D) computational fluid dynamic model established for velocity, temperature profiles, exergy, and irreversibility for Reynolds number 5000 and 20,000. The impact of external inserts and Reynolds number were discussed on Nu, f, temperature, and Sgen. The insertion of external inserts increases the Nu and f. When Re increases from 5000 to 20000, Nu increments about 204.21% without external inserts in the twisted tape. For the twisted tapes with external inserts, Nu increases about 202.87%. With external inserts, the entropy generation is reduced to 45% at Re = 5000 and 7% when Re is increased from 5000 to 20,000. An increment in Nusselt number and frictional entropy generation and a reduction in friction factor and thermal irreversibility are observed with an increase in Reynolds number. Consequently, it can be determined that employing nanofluids and twisted tapes in heat exchanger decreases exergy losses and enhance heat transfer performance due to a decrement in thickness of thermal boundary layer.

Numerical investigation of various twisted tapes enhancing a circular microchannel heat sink performance

The continuous power increase and miniaturization of modern electronics require increasingly effective thermal management systems. The thermo-hydraulic performance of water-cooled L×L square-base silicon microchannel heat sinks is investigated by a conjugate heat transfer and computational fluid dynamics model over the Reynolds number range 100 to 500. Water at a constant inlet temperature of 298 K runs through 33 parallel tubes, extracting heat from the bottom wall that has a 100 W/cm2 constant heat flux input. Hydro-thermal performance-enhancing tape inserts are numerically tested featuring (i) radial gaps between the tape and the tube, (ii) tape twist with axial pitch distances of ∞, L/2, or L/4, (iii) zero, one, or two 90-degree angular steps between consecutive tape segments, (iv) alternating clockwise and anti-clockwise consecutive twisted tape segments, and combinations of these features. The radial gaps produce both a hydraulic and a thermal performance loss. All combinations of tape twist, angular steps, and twist direction reversal produced better thermal performance gains to hydraulic loss trade-offs than the baseline microchannel configuration with no tape. The microchannel heat sinks with four L/4 alternating pitch consecutive helical tape segments provided the lowest bottom wall average temperature, 16.13 K below that with not tape, at the same Reynolds number of 500. This predicted temperature drop is a significant achievement towards conditioning electronic components so they may be longer-lasting, use less energy, and have a reduced environmental impact.

Analysis of numerical and grey relation method of the effect of helical tape insert density on the hydrothermal performance

In this study, the hydrothermal performance of the Double pipe heat exchangers(DPHEs) with a continuous and variable helical tape insert(HTI) conducted on the outer surface of the inner pipe was numerically investigated by using the generated three-dimensional(3D) computational fluid dynamics(CFD) models. The numerical analyzes were performed under variable pitch ratios (0.167≤λ≤0.500), annulus side Prandtl number(Pr) (5.9≤Pran≤7.8) and Reynolds numbers(Re) (4200≤Rean≤16000) conditions. The numerical model was first validated for the conventional equal HTI DPHE model by comparison with experimental data obtained from the literature and empirical correlations. The validated model was then used to determine the effects of the variable HTI on the outer surface of the inner pipe. The relationship between the Nusselt number(Nu) and Darcy friction factor(f) was examined by using Grey Relation Analysis(GRA) method. The using of the denser HTIs on the tube side inlet region increases Nu about 9% compared with the conventional model. The f values of the models with variable HTI densities were calculated as higher than the Equal model under all Re conditions. The obtained results from the GRA method, conventional Equal model can be used for low Re, but the Inlet model can be preferred for 14000 and above Re conditions.

Efficacy of turbulator on performance of parabolic solar collector with using hybrid nanomaterial applying numerical method

The objective of current work is to find the impact of inserting new multi helical tapes within the pipe of parabolic-trough collector (PTC). In concentrating units, the ranges of temperature are high and for present study, mixture of hybrid nanoparticles (Al2O3 and MWCNT) and oil was applied as operate fluid. With considering low fraction of each nano-powder, homogeneous model is reasonable for this application with assuming temperature-dependent properties. Simulation of such turbulent flow with considering variable heat flux for outer wall has been done by means of finite volume approach. From verification procedure, it is evident that nice agreement can be achieved if K-ε RNG technique has been selected. Different cases were presented in outputs which depict the influences of pitch ratio (PR), number of segments (NoS) and Re. With augment of both NoS and PR, the hybrid nanomaterial radial speed augments and stronger recirculation makes finer mixing of fluid. Stronger cross flow causes pressure loss to augment and residence time enhances. As inlet speed of hybrid nanofluid intensifies, Nu elevates around 135.54% while friction factor diminishes about 13.085% when PR = 2.5, NoS = 3. With install of helical tape with greater NoS, Nu increases about 10.17% and f increases around 179.57% when PR = 2.5, Re = 5e3. Darcy factor and Nu intensify around 212.35% and 10.43% with elevate of PR when NoS = 3, Re = 1.2e4.

Nanoparticles transportation with turbulent regime through a solar collector with helical tapes

Utilizing hybrid nanomaterial, fin and helical turbulator were suggested in present investigation to intensify the efficiency of absorber unit. Mixture of water with Al2O3 and CuO creates the working fluid and due to low fraction of nano-powders, formulations were incorporated according to homogeneous modeling approach. Longitudinal plate with circular gaps was considered as fin and helical tape was utilized as turbulator. Verification based on experimental previous work reveals nice concordance. Fraction of hybrid nano-powders, Re and two geometrical factors (pitch factor (Pi) and diameter of circular gaps (D1)) have been reported in outputs. It should be mentioned that number of circular gaps is depend on Pi. Finite volume approach was selected with involve of k-ε RNG technique for simulating turbulent forced convection. As diameter of gap augments, fluid movement becomes easier and pressure loss decreases while better mixing of upper hot fluid and cold one can be reached. As pitch factor declines, the revolution of tapes augments and number of circular gaps increases, too. Although, increase of rotational velocity makes the stronger interaction with wall, the pressure drop can be reduced because of positive effect of higher number of gaps when the diameter of gaps has maximum value. Temperature of absorber plate reduces 0.15% with intensify of Re while it grows about 0.007% and 0.012% with augment of D1 and Pi. Nu augments about 73.59% with augment of pumping power while friction factor declines about 18.32%. In greatest level of Re, rise of D1 and Pi leads to augment of Nu about 6.47% and 6.43%. Also, friction factor reduce about 11.22% and 17.47% with growth of D1 and Pi. Adding hybrid nanomaterial makes Nu and f to rise about 5.26% and 1.52%.

Heat transfer performance with inclusion of nanoparticles and insertion of helical tape

Merit of employing turbulator within a tube was scrutinized not only in view of convective flow but also in term of exergy drop. Inclusion of CuO with concentration lower than 0.05 lets us to consider single phase technique and turbulent modeling was validated by comparing data with empirical correlations. Install of tapes makes the intensity of flow increases and contact of nano powders with solid surface increases which provide greater pressure drop while Nu enhances with impose of such device. Thinner boundary layer can offer lower temperature of domain and this observation can be occurred when grater values of b and Re have been selected. Higher b offers greater impact of Re while augment of Re provides lower impact of b. Exergy drop faces 5.19% reduction with rise of b from 5 to 10 when highest inlet velocity employed. At b = 5, Xd for Re = 5000 is 9.87 time greater than those of Re = 15,000. When Re = 5000, Darcy factor for b = 15 is 2.04 time greater that of b = 5. At b = 15, growth of inlet velocity offers 32.47% reduction in Darcy factor.

Detection of band edge frequencies in symmetric/asymmetric dielectric loaded helix slow‐wave structures

AbstractThe significant contribution of this paper is to present a comprehensive analysis and design of π‐point and band edge frequencies of reported helix SWSs including not only a microwave but also millimeter‐wave operation frequencies considering the methods in available literature which are the Coupled Mode Analysis (CMA), the Exact Floquet Approach (EFA), and the Auxiliary Functions of Generalized Scattering Matrix (AFGSM) as a comparative study. A different approach called as effective rod model is applied to circular/T‐shaped dielectric support rod helix SWSs in order to obtain ladder circuit representation of one turn of related helix SWSs for the first time. Scattering matrices of equivalent circuit representation of interested helix SWSs are obtained by using microstrip line model of helix SWS which slits helical tape at the effective helix radius along the direction normal to the helix winding direction and flattens it out for the EFA, the AFGSM, and the CMA methods. Additionally, comparisons are given for investigated methods together with the results of Computer Simulation Technology (CST) design environment, and good agreement has been observed among numerical results of different helix SWSs in a broad frequency range.

A Numerical Simulation Study to Improve Heat Transfer Rate in a Double Pipe Heat Exchanger using Different ways.

In this work the thermo hydraulic performance of double pipe heat exchanger made of stainless-steel with inner and outer diameters are (11.43 and 16.83cm) respectively, 0.305cm thickness and150cm length, studied numerically by using Solid Works 2016 package. It is used to the purpose of preheat heavy fuel oil flow in the outer pipe by hot air flow inside the inner one. Helical tape with different pitches (11, 14, and 17) cm the inner side of the inner tube and helical fin with different fin spaces (10, 20, and 30) cm over the inner tube are used as an enhancement heat transfer device. The study was conducted with specific identifiers, Reynold’s number (Re) values are (31668, 47361, 63008, 78589) for air side (inner tube), oil inlet temperature is (313) K and flow with rate of oil (0.1 and 0.06 kg/s). The results were first verified by using both the inner helical tape and outer helical fin separately and comparing the results of them with the plain tube, and then combining each of the helical tape and helical fin together and indicating the improvement in heat transfer rate, the result show that the maximum heat transfer is (4559.726 W) obtained by merged the helical tape with smaller pitch (11 cm) and helical fin with low fin pitch (10 cm) at oil flow rate (0.1 kg/s) as compared with (2052.385W) for plain tube, the maximum enhancement percentage in heat transfer rate and overall heat transfer coefficient were is (122.167 % and 142.941%) at the same conditions. The maximum enhancement in Nusselt number (Nu) and convection heat transfer coefficient were (224.572 % and 129.523 % W/m2. K) respectively were achieved by using helical tape with pitch (11 cm). At higher Reynolds number, the higher-pressure drop for air side is (7437.8 pa) obtained when using minimum pitch for helical tape and it is (1086.26 pa) for oil side by using helical fin with pitch (10 cm).

High strength tape layer modeling for analysis of flexible pipe axisymmetric behavior and birdcaging limit

Flexible pipes are critical elements for offshore oil and gas development and determining its response in axisymmetric loadings is of paramount importance. Often the anti-birdcage tape layer is represented by a tubular structure with either isotropic or orthotropic material properties. However, it is recognized that a tubular structure cannot fully replicate the stiffness and strength and deformation mechanisms of helically wound tape layers. This paper presents a mathematical model for the local analysis of unbonded flexible pipes subjected to axisymmetric loadings where three anti-birdcage tape layer modeling strategies are presented including helical tape, orthotropic and isotropic tubes. This model is then verified against existing test data. The deviations caused by the orthotropic and isotropic tube modeling strategies in different loading conditions are discussed. This is followed by parametric studies on the effects of anti-birdcage tape tensile stiffness, laying angle and direction on the flexible pipe mechanical behaviors in tension, axial rotation in both directions, axial compression, as well as birdcaging limit loads. The importance of considering non-uniform tensions in the filaments that constitute the tape is discussed.

Thermohydraulic performance and second law analysis of a tube embedded with multiple helical tape inserts

ABSTRACT The present investigation deals with the analysis of the heat exchanger tube by inserting the multiple helical tape geometry to determine the heat transfer, friction factor, thermal performance, and entropy generation experimentally. The helical tapes designed for current investigation are analyzed in terms of geometrical parameters namely number of tape (1,2,3), twist ratio (2,3,4), and width ratio (0.4). The experiments are conducted in the range of Reynolds number lying in turbulent region from 5000 to 29000. The experimentation affirms an enhancement of the thermal performance. The experimental data reveal that there is 3.95 times enhancement in the heat transfer for twist ratio of 2 and number of tapes of 3. The thermal performance factor is enhanced by 1.23 times over smooth tube for the twist ratio of 2 and number of tapes of 1. It is observed that the maximum heat transfer enhancement is found for low and high values of twist ratio and number of tapes, respectively. The rate of entropy generation is less for the tube equipped with helical tape inserts for all possible cases than smooth tube. The minimum entropy generation value of 0.27 is observed for twist ratio of 2 and number of tapes 3. The developed empirical correlations for Nusselt number, friction factor, and thermal performance factor are in good agreement with experimental results.

Heat recovery application of nanomaterial with existence of turbulator

In current context, turbulent flow with install of helical tape has been analyzed in a system in which nanofluid was utilized in shell side. Both hydrothermal and exergy analysis are presented. Hot gas and H2O-CuO nanofluid are considered as working fluids. FVM is utilized to explore the roles of Re, number of revolution (N) on hydrothermal treatment. Suitable correlations for entropy components are extracted according to obtained data. Radial velocity can be augmented with enhance of revolution and inlet velocity of nanofluid. So, friction augments and higher values of pressure drop can be achieved. Augment of revolution leads to augmentation of pressure loss about 95.25% and 81.42% depend on the values of Re. When revolution has highest value, pressure drop faces 389.4% augmentation with rise of Re. With assuming largest amounts of other variables, growth of Re makes outlet temperature to reduce about 8.4% while rise of N results in 0.73% augmentation in Tout. Assuming N=7, augment of Re leads to decline Xd by 64.29%. At Re⁎=5, growth of N up to 7 makes Xd to reduce about 62.43%.

Convection Heat Transfer and Friction Factor of AL2O3/ Water Nanofluid Flows inside Circular Tube with Inserting Helical Tape.(Dept.M)

Forced convection heat transfer and friction factor for nanofluid flows inside circular horizontal tube with and without inserting helical tape, was experimentally studied. Electric heater was wrapped around the outer surface of the tube to obtain a constant and uniform heat flux at the tube wall. Experiments are conducted with adding nano-particles (AI2O3) to water up 10, 2% by volume 10 obtain diffrerent concentrations of nanonfluids. An experimental test loop equipped with the required measuring instruments was designed and constructed to assess the effects of nano-particles concentration, mass flow rate, and applied heat flux on the convection heal transfer process and pressure drop. The tested tube fitted with screw helical tape inserts to evaluate its effects on heal transfer rate and friction factor with nanofluid as the working fluid compared with pure water. The measurements of temperature, now rate, applied volt and pressure drop are recorded and manipulated to calculate the convection heat transfer coefficient and friction factor. The obtained experimental results show that, wall temperature was reduced by using nanofluid compared with pure water. Accordingly. the convection heal transfer coefficient;' increased when using nanofluid and increased also with increasing heat flux and mass now rate (Reynolds number). Higher rates of heat transfer and pressure drop are obtained from the tube fitted with screw helical tape insert compared to flow in a plain/tube under similar conditions. This improvement in the heat transfer coefficient characterized by a swirling flow as a result of the secondary flow of the fluid flow inside tube with helical tape. The average value for the thermal-hydraulic performance(ŋ) for tube with inserting helical tape was 1.4 for water only , and 1.8 for nanofluid at concentration 0.8% comparison with the previous work gave good agreement.

Numerical optimization of flame stability in a swirl combustion chamber with helical tapes

In this study, the effects of forced vortices on non-premixed flames' reaction are investigated using Computational Fluid Dynamics (CFD) in a cylindrical chamber with an internal helix. For this purpose, using the Response Surface Method (RSM), optimization has been performed to increase the flame's stability by considering two parameters of the geometric variable and the objective function of increasing its thermal efficiency. Two different geometrical parameters of the helix, i.e., width and pitch, are varied, and their effects on vortex generation and mixing inside the chamber are investigated for various Reynolds numbers. Results show that combustion's overall efficiency could be improved by carefully altering the helix's width and pitch. This study indicates that helical tapes can increase the combustion rate at lower equivalence ratios, which reduces the concentration of greenhouse gases and pollutants in combustion. By decreasing the width and the step rates of helical tape, the flame moves closer to the chamber's centerline, and the reaction zone elongates axially. Hence, the average temperature of the chamber is comparatively increased. Studies show that by doubling the Reynolds number, the reaction rate increases, and the chamber average temperature increases by about 28%. The best performance is achieved when helical tape with a small pitch and width is used.