Cylinder Rotation Speed Research Articles

Dynamic simulation analysis on loader’s working device

ABSTRACTThe structure and performance of the working device of the loader have a significant effect on the working size, production efficiency, production cost and market competitiveness of the whole machine. In order to improve the overall performance of loaders’ working devices, dynamic simulation analysis of loaders’ working devices is carried out by using the mechanical system dynamics simulation analysis software ADAMS. A three-dimensional model of working device of loader is established by using Pro/E, and its working status and mechanical simulation carried out by using ADAMS. Finally, the envelope of motion simulation, the centre curve of bucket, the curve of cylinder rotation speed and acceleration, and the force diagram of each hinge point are given. The result shows that the model design of the load working device is in accordance with the actual product, which provides the basis for future analysis and structural optimisation.

Transient behaviors of mixed convection in a square enclosure with an inner impulsively rotating circular cylinder

This work numerically investigated the unsteady mixed convective heat transfer between a square enclosure and an inner concentric circular cylinder maintained at different temperatures. The cylinder undergoes a transition of motion whose physics is significant for engineering applications such as cooling of rotating shaft and lubricating of journal bearing. It keeps stationary at first and steady-state natural convective flow is achieved, then impulsively rotates at a constant angular velocity and the flow arrives at a new final steady-state. Although the mixed convective heat transfer for rotating cylinder configurations are analyzed in a number of works, the transient behaviors of the thermal and flow characteristics from the onset of cylinder rotation to the final steady-state are not investigated, which restrains the thorough understandings on the relevant flow physics and mechanisms. The present work performs the first numerical investigation on the targeted physical problem. The objective is to explore the transient characteristics of the mixed convective heat transfer, and to identify the effects of cylinder rotation and rotation speed (tangential velocity at cylinder surface, V0) on the flow and heat transfer behaviors. The results are presented and analyzed by the temporal variations and spatial distributions of the thermal field, mean heat transfer rate, local heat transfer rate and velocity/temperature in certain regions where the flow is significantly affected. Our numerical results for the first time identify two flow regimes depending on the tangential velocity: mixed buoyancy-shear stress dominated flow for V0 ≤ 1.0 where the effect of natural convection is pronounced and the flow is driven by both buoyancy and shear stress from the cylinder surface, and shear stress dominated flow for V0 ≥ 2.0 where the flow is almost entirely driven by rotating cylinder and heat transfer is realized by conduction. The transient behaviors of the thermal and flow quantities are characterized and categorized based on the two regimes.

Large-eddy simulation of flow over a rotating cylinder: the lift crisis at

We present wall-resolved large-eddy simulation (LES) of flow with free-stream velocity $\boldsymbol{U}_{\infty }$ over a cylinder of diameter $D$ rotating at constant angular velocity $\unicode[STIX]{x1D6FA}$ , with the focus on the lift crisis, which takes place at relatively high Reynolds number $Re_{D}=U_{\infty }D/\unicode[STIX]{x1D708}$ , where $\unicode[STIX]{x1D708}$ is the kinematic viscosity of the fluid. Two sets of LES are performed within the ( $Re_{D}$ , $\unicode[STIX]{x1D6FC}$ )-plane with $\unicode[STIX]{x1D6FC}=\unicode[STIX]{x1D6FA}D/(2U_{\infty })$ the dimensionless cylinder rotation speed. One set, at $Re_{D}=5000$ , is used as a reference flow and does not exhibit a lift crisis. Our main LES varies $\unicode[STIX]{x1D6FC}$ in $0\leqslant \unicode[STIX]{x1D6FC}\leqslant 2.0$ at fixed $Re_{D}=6\times 10^{4}$ . For $\unicode[STIX]{x1D6FC}$ in the range $\unicode[STIX]{x1D6FC}=0.48{-}0.6$ we find a lift crisis. This range is in agreement with experiment although the LES shows a deeper local minimum in the lift coefficient than the measured value. Diagnostics that include instantaneous surface portraits of the surface skin-friction vector field $\boldsymbol{C}_{\boldsymbol{f}}$ , spanwise-averaged flow-streamline plots, and a statistical analysis of local, near-surface flow reversal show that, on the leeward-bottom cylinder surface, the flow experiences large-scale reorganization as $\unicode[STIX]{x1D6FC}$ increases through the lift crisis. At $\unicode[STIX]{x1D6FC}=0.48$ the primary-flow features comprise a shear layer separating from that side of the cylinder that moves with the free stream and a pattern of oscillatory but largely attached flow zones surrounded by scattered patches of local flow separation/reattachment on the lee and underside of the cylinder surface. Large-scale, unsteady vortex shedding is observed. At $\unicode[STIX]{x1D6FC}=0.6$ the flow has transitioned to a more ordered state where the small-scale separation/reattachment cells concentrate into a relatively narrow zone with largely attached flow elsewhere. This induces a low-pressure region which produces a sudden decrease in lift and hence the lift crisis. Through this process, the boundary layer does not show classical turbulence behaviour. As $\unicode[STIX]{x1D6FC}$ is further increased at constant $Re_{D}$ , the localized separation zone dissipates with corresponding attached flow on most of the cylinder surface. The lift coefficient then resumes its increasing trend. A logarithmic region is found within the boundary layer at $\unicode[STIX]{x1D6FC}=1.0$ .

Characterization of Roasted Coffee Aroma by Optimizing Roaster Parameters

This study was aimed to improve the quality of aroma of roasted coffee by using Taguchi's design as experimental technique. The roaster parameters evaluated were temperature, incubation time, moisture content and cylinder rotational speed. An orthogonal array L9, signal to noise ratio and ANOVA were employed to investigate the influence of the roaster parameters. The results showed that the optimal roasted coffee aroma was produced at a temperature of 170◦C, incubation time of 14 minutes, moisture content of 6% (v/w) and cylinder rotational speed of 50 rpm. The most to less significant roasting parameters as observed in this study were as follows: temperature, incubation time, moisture content and cylinder rotational speed. Furthermore, the results showed that the Taguchi design was better than the full experimental design in solving experiments with a minimum number.
 Keywords: ANOVA, Coffee roaster, Roasted coffee aroma, Signal to noise ratio, Taguchi technique

Magnus Wind Turbine Emulator With MPPT by Cylinder Rotation Control

An emulator for the nonconventional Magnus wind turbine was designed and developed in this study. A brief discussion is made of this special case of horizontal axis wind generator and of the main physics principles involving the Magnus phenomenon. A mathematical model was used to emulate the static behavior of the Magnus wind turbine and a detailed analysis is presented about its peculiar rotating cylinder characteristics. Based on the relationship between cylinder blade rotation and power coefficient, a hill climb search algorithm was developed to perform maximum power point tracking. The impact of the cylinder's rotation speed on the turbine net output power was evaluated. A controlled direct current motor was used to provide torque, based on the Magnus turbine model, and drive a permanent magnet synchronous generator (PMSG); the latter was controlled by a buck converter in order to extract the maximum generated power (MGP). Simulations of the Magnus wind turbine model and its maximum power point tracking (MPPT) control are also presented. A prototype of the proposed emulator was developed and operated by a user-friendly LabVIEW interface. Measurements of the power delivered to the load were acquired for different wind speeds; these results were analyzed and compared with simulated values showing a good behavior of the emulator with respect to the turbine model. The proposed control technique for maximizing the output power was validated by emulated results. The modeling and development of the Magnus turbine emulator also serve to encourage further studies on generation and control with this wind machine.

Experimental Test of 3kW Cylindrical Wave Energy System with Horizontal Rotation

Park, M.-S.; Jeong, Y.-J., and Kim, J., 2018. Experimental test of 3kW cylindrical wave energy system with horizontal rotation. In: Shim, J.-S.; Chun, I., and Lim, H.S. (eds.), Proceedings from the International Coastal Symposium (ICS) 2018 (Busan, Republic of Korea). Journal of Coastal Research, Special Issue No. 85, pp. 1311–1315 Coconut Creek (Florida), ISSN 0749-0208.Since the potential of wave energy has been recognized for long and mostly associated with a nondestructive renewable energy, the wave energy has gained attention from many countries to find alternative and reliable energy sources. In the present study, 3kW cylindrical wave energy system with horizontal rotation is newly suggested. The suggested cylindrical wave energy system is composed of the horizontal cylinder, the swing plate and the yawing body. In order to verify the efficiency of cylindrical wave energy system, the experimental test is carried out using 3D wave basin for various parameters. The rotation speed of horizontal cylinder is strongly depended on the height of draft and the distance between the horizontal cylinder and the swing plate, and the period of swing plate is closely related to the period of incident wave. It is found that the suggested cylindrical wave energy system has more wave power available for a wide range of incident wave frequencies.

Helical flow of a Bingham fluid arising from axial Poiseuille flow between coaxial cylinders

• Equations of motion are obtained for helical flow of a Bingham fluid with a floating core between coaxial concentric cylinders. • A small dimensionless parameter m intrinsic to the flow is identified. • Perturbation methods based on small m are applied to obtain approximations to the fluid flow field and related quantities. • These expressions are compared with the results of numerical calculations. The Bingham fluid model represents viscoplastic materials that display yielding , that is, behave as a solid body at low stresses, but flow as a Newtonian fluid at high stresses. In any Bingham flow, there may be regions of solid material separated from regions of Newtonian flow by so-called yield boundaries . Such materials arise in a range of industrial applications. Here, we consider the helical flow of a Bingham fluid between infinitely long coaxial cylinders, where the flow arises from the imposition of a steady rotation of the inner cylinder (annular Coutte flow) on a steady axial pressure driven flow (Poiseuille flow), where the ratio of the rotational flow compared to the axial flow is small. We apply a perturbation procedure to obtain approximate analytic expressions for the fluid velocity field and such related quantities as the stress and viscosity profiles in the flow. In particular, we examine the location of yield boundaries in the flow and how these vary with the rotation speed of the inner cylinder and other flow parameters. These analytic results are shown to agree very well with the results of numerical computations.

Mixed convection heat transfer enhancement in a cubic lid-driven cavity containing a rotating cylinder through the introduction of artificial roughness on the heated wall

The aim of the present numerical investigation is to comprehensively analyse and understand the heat transfer enhancement process using a roughened, heated bottom wall with two artificial rib types (R-s and R-c) due to unsteady mixed convection heat transfer in a 3D moving top wall enclosure that has a central rotating cylinder, and to compare these cases with the smooth bottom wall case. These different cases (roughened and smooth bottom walls) are considered at various clockwise and anticlockwise rotational speeds, −5 ≤ Ω ≤ 5, and Reynolds numbers of 5000 and 10 000. The top and bottom walls of the lid-driven cavity are differentially heated, whilst the remaining cavity walls are assumed to be stationary and adiabatic. A standard k-ε model for the Unsteady Reynolds-Averaged Navier-Stokes equations is used to deal with the turbulent flow. The heat transfer improvement is carefully considered and analysed through the detailed examinations of the flow and thermal fields, the turbulent kinetic energy, the mean velocity profiles, the wall shear stresses, and the local and average Nusselt numbers. It has been concluded that artificial roughness can strongly affect the thermal fields and fluid flow patterns. Ultimately, the heat transfer rate has been dramatically increased by involving the introduced artificial rips. Increasing the cylinder rotational speed or Reynolds number can enhance the heat transfer process, especially when the wall roughness exists.

Influence of Fluid Motions on Polymorphic Crystallization of l-Histidine: Taylor Vortex Flow and Turbulent Eddy Flow

The mechanistic influence of fluid motions, such as a Taylor vortex flow and turbulent eddy flow, on the polymorphic crystallization of l-histidine was investigated. Couette–Taylor (CT) and mixing tank (MT) crystallizers were used for the Taylor vortex flow and turbulent eddy flow, respectively. Due to its periodic fluid motion, the Taylor vortex flow was found to be more favorable than the turbulent eddy flow for polymorphic nucleation of the stable phase. Thus, the polymorphic fraction of the stable phase at the induction point (called the “initial stable polymorphic fraction”) in the CT crystallizer was always much higher than that in the MT crystallizer for all variations of the crystallization conditions, including the rotation/agitation speed, ethanol fraction in the mixture solvent, and cooling rate. When increasing the rotation speed of the inner cylinder in the CT crystallizer, the initial stable polymorphic fraction was significantly increased and reached 100% at a rotation speed above 700 rpm. ...

A comparison study of mixed convection heat transfer of turbulent nanofluid flow in a three-dimensional lid-driven enclosure with a clockwise versus an anticlockwise rotating cylinder

A turbulent 3D mixed convective flow of pure water, H2O, and nanofluid, SiO2-H2O, inside a differentially heated moving wall enclosure containing an insulated rotating cylinder over a range of rotational speeds, −5≤Ω≤5, Reynolds numbers, 5000 and 10,000, and constant Grashof number, is numerically investigated. A cooled lid-driven top wall and a heated bottom wall are the only thermally uninsulated walls in this domain. A standard k-ε for the Unsteady Reynolds-Averaged Navier-Stokes (URANS) approach is applied to the turbulence calculation. Nusselt number, mean velocity profile, streamline, isothermal and isosurface temperatures are derived and presented in this paper to gain a better understanding of the effects of clockwise and anti-clockwise rotating cylinder directions on the heat transfer and flow patterns. Interesting changes in flow structure and heat transfer have been analysed for all rotational speeds and fluid types at both Reynolds number values. Nonlinear increases in Nusselt number have been observed by using nanofluid instead of pure water. The wall shear stress and turbulent kinetic energy profiles are found to be influenced by changing the Reynolds number and rotational speed and direction. Furthermore, incremental heat transfer rates at the walls can be achieved by increasing the cylinder rotation speeds, but these increases have weaker influences on the top wall than on the bottom wall.

Synthesis of Core–Shell Particles of Nickel–Manganese–Cobalt Hydroxides in a Continuous Couette-Taylor Crystallizer

A Taylor vortex flow was used as an effective continuous process for synthesizing uniform and spherical core–shell particles of nickel–manganese-cobalt hydroxides, consisting of a (Ni0.90Mn0.05Co0.05)(OH)2 (Ni-rich hydroxide) core and (Ni0.475Co0.05Mn0.475)(OH)2 (half–half hydroxide) shell. Tiny half–half hydroxide particles (primary particles) were initially precipitated and then adhered to core particles of the Ni-rich hydroxide to form core–shell particles via collision and agglomeration between the primary particles and the core particles. pH 10 was determined as the optimum condition for maximizing the interaction between the primary particles and the core particles. The shell-layer formation depended strongly on the operating parameters of the Couette-Taylor (CT) crystallizer, including the inner cylinder rotation speed, reactant concentration, and mean residence time. Using those parameters, the shell-layer thickness was controlled from 0.4 mm to 2.0 mm. Plus, a narrow size distribution (coefficien...

Effect of sinusoidal Taylor vortex flow on cooling crystallization of L-lysine

An elliptical Couette-Taylor (ECT) crystallizer with a unique sinusoidal Taylor vortex flow was developed to promote the recovery and size distribution of L-lysine crystals in cooling crystallization. When using the ECT crystallizer, the recovery was enhanced to a maximum of 100% with a mean residence time of only 15 min. When comparing the crystallization efficiency, the recovery and size distribution of the L-lysine crystals in the ECT crystallizer were over 33% and 50% higher, respectively, than those in the conventional MSMPR crystallizer and slightly higher than those in the circular Couette-Taylor (CT) crystallizer. This improved crystallization in the ECT crystallizer was explained in terms of the sinusoidal profile of the Taylor vortex intensity. Plus, since the nucleation and growth processes determine the recovery and crystal size distribution, the mean residence time, inner cylinder rotation speed, and feed concentration were all varied to investigate their influence on the crystallization efficiency.

Rotation mechanism of ultrasonically levitated cylinders

The rotation of levitated object in the ultrasonic levitation experiment is a common phenomenon. This instability may give rise to many difficulties in locating and detecting the levitated object and even cause the experiment to fail. However, the relevant research of the rotation mechanism of levitated object is seldom carried out. In this work, the rotation mechanism of cylinder in a single-axis ultrasonic levitator is investigated experimentally and theoretically. In the ultrasonic levitation experiment, the cylinder begins to rotate about an axis along the vertical direction as it is levitated at the node between the emitter and reflector. The rotation speed of cylinder tends to a stable value due to the effect of the air resistance, and the final rotation direction is determined by its initial rotation state. Experimental results demonstrate that the rotation speed increases with the decreases of density and length-to-diameter ratio of the cylinder. In order to analyze the rotation mechanism, the finite element method is used to calculate the distribution of acoustic pressure field and the torque acting on the cylinder for each of three different cases. Numerical results reveal that the position offsets of the cylinder and the reflector as well as the tilt of the emitter can all result in the nonaxisymmetrical distribution of acoustic pressure field. Hence, a nonzero torque acting on the cylinder may be generated and the rotation state of the levitated cylinder is subsequently affected. The position offset of the cylinder can produce a torque driving itself to rotate and the torque increases with the increase of the deviation degree. A restoring torque suppressing the rotation of cylinder can be generated by deviating the reflector from the horizontal direction. The cylinder eventually keeps stationary state with its axis perpendicular to the offset direction of the reflector, showing good accordance with the experimental results. In addition, it is predicted that tilting the emitter can also offer a restoring torque which makes cylinder eventually static with its axis perpendicular to the plane through the axes of the emitter and the reflector. However, this restoring torque is approximately three orders of magnitude smaller than that generated by deviating the reflector. In the end, both experimental results and numerical simulations show that the rotation of the cylinder can be effectively suppressed under the disturbance of two fixed cylinders when the emitter and the reflector are coaxial. The cylinder eventually stays still and keeps coaxial with the two fixed cylinders.

Batch Cooling Crystallization in Non-Isothermal Taylor Vortex Flow: Effective Method for Controlling Crystal Size Distribution

A non-isothermal Taylor vortex fluid motion was applied for effective control of the crystal size distribution (CSD) in batch cooling crystallization without seed crystals. The non-isothermal Taylor vortex fluid motion was generated using different cylinder temperatures, i.e., a hot inner cylinder and cold outer cylinder, in a Couette–Taylor (CT) crystallizer. Thus, an internal loop of heating dissolution of crystals on the inner cylinder and cooling recrystallization on the outer cylinder was created in the gap between the two cylinders by the Taylor vortex fluid motion. As a result, the crystal size distribution can be effectively controlled by adjusting the operating parameters, including the temperature difference between the inner and outer cylinders, rotation speed of the inner cylinder, and cooling rate in the CT crystallizer. When increasing the temperature difference, the mean crystal size becomes larger and the CSD becomes narrower. Meanwhile, increasing the rotation speed enlarges the mean crystal size and broadens the CSD. Conversely, a fast cooling rate reduces the mean crystal size and narrows the CSD. The mean crystal size and CSD in the non-isothermal CT crystallizer are 3–4 times larger and 30–40% narrower, respectively, when compared with those in the isothermal CT crystallizer and mixing tank crystallizer.

Synthesis of Monodisperse Silica Particles using Rotating Cylinder Systems

Monodisperse silica nanospheres were synthesized by Stober method using rotating cylinder systems with batch or continuous manner. The particle size could be controlled by adjusting the reactant compositions such as the amount of monomer, catalyst, and water in the reaction mixture. The size and monodispersity of the ceramic particles could be controlled by changing the reaction medium with different alcohols other than ethanol or changing the reaction temperature. The effect of Taylor number (Ta) on the average diameter and standard deviation of silica particles were also studied by adjusting the rotation speed of inner cylinder, and the maximum diameter of particles was observed at Ta ? 3,000.

Comprehensive computational model for combining fluid hydrodynamics, light transport and biomass growth in a Taylor vortex algal photobioreactor: Lagrangian approach

A comprehensive quantitative model incorporating the effects of fluid flow patterns, light distribution, and algal growth kinetics on biomass growth rate is developed in order to predict the performance of a Taylor vortex algal photobioreactor for culturing Chlorella vulgaris. A commonly used Lagrangian strategy for coupling the various factors influencing algal growth was employed whereby results from computational fluid dynamics and radiation transport simulations were used to compute numerous microorganism light exposure histories, and this information in turn was used to estimate the global biomass specific growth rate. The simulations provide good quantitative agreement with experimental data and correctly predict the trend in reactor performance as a key reactor operating parameter is varied (inner cylinder rotation speed). However, biomass growth curves are consistently over-predicted and potential causes for these over-predictions and drawbacks of the Lagrangian approach are addressed.

Pharmaceutical crystallization in Couette-Taylor crystallizer: A case study of polymorphism of amino acid L-glutamic acid

The influence of intensity Taylor vortex flow in Couette-Taylor crystallizer on the crystallization of polymorphic amino acid L-glutamic acid was investigated in cooling crystallization. Here, the L-glutamic acid was chosen as the model crystal product, where it has two kinds of polymorphism including the unstable phase α-form and stable phase β-form crystal. In cooling crystallization, the α-form crystal transformed to the β-form crystal corresponding to the phase transformation of α-form to β-form crystal. The present study found that the selective polymorphism of α-form and β-form crystal as well as the phase transformation significantly depended on the intensity of turbulent Taylor vortex flow in Couette-Taylor crystallizer. Here, the selective β-form nucleation and phase transformation were remarkably promoted as increasing the rotation speed of inner cylinder in Couette-Taylor crystallizer. By comparison with the conventional stirred tank (ST) crystallizer, the Couette-Taylor (CT) crystallizer was at least 2.0 times more effective as regards the selective β-form polymorphism and phase transformation time. The advantage of CT crystallizer over the conventional ST crystallizer was explained in terms of the high shear stress and mass transfer of turbulent Taylor vortex flow in CT crystallizer. Here, the shear stress of Taylor vortex flow in CT crystallizer was at least 23.0 times higher than that of fluid motion in conventional ST crystallizer, whereas the mass transfer of Taylor vortex flow in CT crystallizer was at least 1.2 times higher than that of fluid motion in conventional ST crystallizer. As such, the high turbulent shear stress of Taylor vortex flow was expected to promote the β-form nucleation via the effective molecules alignment, whereas the high mass transfer of Taylor vortex flow facilitated the dissolution rate of α-form and growth rate of β-form crystal, resulting in an acceleration of phase transformation rate.

THE INFLUENCE OF CALCIUM NITRATE ON THE PLASTICIZING EFFECT OF CEMENT PASTE

The rheological properties of the cement pastes have been determined using a rotational viscometer under a special testing routine by increasing and retaining a steady rotation speed of the viscometer cylinder up to certain values and for a certain time. These tests, using rotational viscometer, have been conducted by making the assessment of ce­ment paste flow curves, using Bingham rheological model. Rheological properties of cement pastes were tested at dif­ferent times after pastes mixing: 0 min, 30 min, 60 min, 90 min, 120 min and 180 min. Cement pastes with same W/C ratio equal to 0.35 were tested. The content of admixture was used 0%, 0.5%, 1%, 2%, 3% and 5%. The admixture of Ca(NO3)2 can be used in cement pastes and concretes without a reduction in consistency during 120 min in the dosage of up to 2%. Dosages of Ca(NO3)2 from 3% are not recommended for cement pastes and concrete, they significantly increase the viscosity of mixtures immediately after mixing The admixture of calcium nitrate changes thixotropy of ce­ment pastes. In this case, a bigger dosage of calcium nitrate increases the thixotropy of pastes.

Exploring the hole cleaning parameters of horizontal wellbore using two-phase Eulerian CFD approach

The present investigation deals with the flow through concentric annulus with the inner cylinder in rotation. This work has got its importance in the petroleum industries in relation to the wellbore drilling. In wellbore drilling, the issue of the hole-cleaning is very serious problem especially in case of the horizontal drilling process. The effect of the various parameters like slurry flow velocity, inner cylinder rotational speed, inlet solid concentration which affect hole cleaning was discussed. Their effect on the pressure drop, wall shear stress, mixture turbulence kinetic energy, and solid-phase velocity and slip velocity were analyzed, which are responsible for solid-phase distribution. Flow was considered to be steady, incompressible and two-phase slurry flow with water as carrier fluid and silica sand as the secondary phase. Eulerian approach was used for modeling the slurry flow. Silica sand was considered of spherical shape with particle size of 180 µm. ANSYS FLUENT software was used for modeling and solution. Plotting was done using Tecplot software and Microsoft Office.

Removal of Sheet Plastic Materials from Seed Cotton Using a Cylinder Cleaner

U.S.-produced cotton is among the cleanest available in the world; however, pieces of sheet plastic are found occasionally in cotton bales produced in the U.S. Standard cotton ginning equipment is not efficient in removing plastic contaminating seed cotton. The purpose of this work was to examine how selected operating conditions affect the sheet-plastic removal efficiency and fiber loss of one type of gin cleaning machine, the cylinder cleaner. In the first part, two sources of plastic were each tested in a central composite design, varying air flow rate through the machine, seed cotton processing rate, and size of plastic contaminant. In the second part, only one plastic source was used, but two cotton cultivars were tested in a central composite design. An additional response surface variable, cylinder rotation speed, was evaluated. Plastic removal increased linearly with increasing air flow rate and decreasing size of the plastic pieces. The effect of seed cotton processing rate on plastic removal was less significant than the effect of air flow rate or plastic size in the first part and was not statistically significant in the second part. The plastic from shopping bag material was removed more effectively than module wrap material. More plastic was removed at lower cylinder rotation speeds. Fiber loss increased with higher air flow rates or cylinder rotation speeds and lower seed cotton processing rates. Lower cylinder rotation speeds increased plastic removal and decreased fiber loss; selecting the optimum air flow rate was a compromise between plastic removal and fiber loss.