Additional Pressure Drop Research Articles

Effect of oscillation flow induced by lattices on a horizontal gas–solid two-phase flow

This study is focused on reducing the pressure drop, conveying velocity, and power consumption in a horizontal gas–solid flow. Four types of lattice models, which are fixed in the particle inlet, are proposed to easily generate the oscillation of the wake flow to easily convey the gas–solid two-phase flow. A horizontal pipeline with an inner diameter of 80 mm and length of approximately 5 m was used. Polyethylene particles with an average diameter of 2.3 mm and density of 978 kg/m3 were employed as conveying solid materials. The experimental ranges of the average gas velocity and solid mass flow rate were 10–16 m/s and 0.10–0.47 kg/s, respectively. Compared to the nonlattice gas–solid flow, reductions in the total pressure drop, conveying gas velocity, power consumption, and additional pressure loss were achieved in the range of lower gas velocity when using the lattice model. The highest reduction rates of the minimum conveying velocity and additional pressure drop were approximately 5.12% and 15.2%, respectively. In the acceleration region, the particle concentration in the flows with the lattice model was larger than that in the nonlattice flow near the upper part of the pipe and lower than those in the nonlattice flows in the lower part of the pipe. The time-mean axial particle velocity and particle fluctuating velocity in all lattice model flows were higher than those in the nonlattice flow, according to particle image velocimetry measurements, particularly in the upper part of the pipe.

Computational study of rib shape and configuration for heat transfer and fluid flow characteristics of microchannel heat sinks with fan-shaped cavities

Cavities and ribs are usually utilized in the design of microchannel heat sink systems, and their combination may lead to the optimum overall performance. However, it remains unclear how different combination methods contribute to the performance and efficiency of the systems. Computational fluid dynamics simulations were conducted to identify the optimum rib shape and configuration for the systems with fan-shaped cavities. The ribs are rectangular, diamond, hexagonal, or elliptic in cross-section. The effects of rib shape, dimensions, and configuration are investigated, and the optimum comprehensive performance was determined. The results indicated that the shape, dimensions, and configuration of ribs are important factors that affect performance and heat transfer efficiency. The shape and position of ribs must be optimized to minimize pressure drop while maximizing heat removal efficiency. The shape of ribs can be an important factor in obtaining high efficiency of heat removal while limiting the pressure drop across the channels. When the ribs are rectangular in shape, the maximum pressure drop occurs but the maximum relative Nusselt number is achieved. The maximum comprehensive performance factor is achieved when the ribs are elliptic in shape and the Reynolds number is highest. Further improvement in performance can be achieved by choosing particular rib dimensions and configuration. In order to provide appropriate benefit to such a microchannel heat sink system without inducing additional pressure drop that reduces the performance of the system, it is desirable to properly shape and position the ribs relative to the cooling flow and the cavities in a way that takes best advantage of the benefits provided by the combination of cavities and ribs. The effect of trailing edge vortexes on heat transfer performance is significant. A maximum comprehensive performance factor of 1.96 is achieved when the Reynolds number of the laminar flow is 460.

A review of single-phase pressure drop characteristics microchannels with bends

Microfluidic use in various innovative research, many fields aimed at developing an application device related to handling fluid flows in miniature scale systems. On the other hand, on the use of micro-devices for fluid flow the existence of bends cannot be avoided. This research aims to make a comprehensive study of fluid flow characteristics through a microchannel with several possible bends. This study was conducted by comparing Reynolds number versus pressure drop in a serpentine microchannel to gain bends loss coefficient. The result showed that the fluid flow with Re ` 100 did not affect the pressure drop, but on the Reynolds number above that, the pressure drop was increased along with the appears of vortices in the outer and inner walls around the channel bends which causes an increase in an additional pressure drop. The other finding shows that the reduction in diameter bend tube can increase the pressure drop.

Cop Enhancement of Vapour Compression Refrigeration System

This experimental investigation exemplifies the design and testing of diffuser at compressor inlet and nozzle at condenser outlet in vapour compression refrigeration system with the help of R134a refrigerant. The diffuser with divergence angle of 12°,14° and the nozzle with convergent angle 12°,14° are designed for same inlet and outlet diameters. Initially diffusers are tested at compressor inlet diffuser is used with inlet diameter equal to exit tube diameter of evaporator and outlet tube diameter is equal to suction tube diameter of the compressor. Diffuser helps to increases the pressure of the refrigerant before entering the compressor it will be helps to reduces the compression work and achieve higher performance of the vapour compression refrigeration system. Then nozzles are testing at condenser outlet, whereas nozzle inlet diameter equal to discharging tube diameter of condenser and outlet diameter equal to inlet diameter of expansion valve. Additional pressure drop in the nozzle helped to achieve higher performance of the vapour compression refrigeration system. The system is analyzes using the first and second laws of thermodynamics, to determine the refrigerating effect, the compressor work input, coefficient of performance (COP).

Cop Enhancement of Vapour Compression Refrigeration System

This experimental investigation exemplifies the design and testing of diffuser at compressor inlet and nozzle at condenser outlet in vapour compression refrigeration system with the help of R134a refrigerant. The diffuser with divergence angle of 12°,14° and the nozzle with convergent angle 12°,14° are designed for same inlet and outlet diameters. Initially diffusers are tested at compressor inlet diffuser is used with inlet diameter equal to exit tube diameter of evaporator and outlet tube diameter is equal to suction tube diameter of the compressor. Diffuser helps to increases the pressure of the refrigerant before entering the compressor it will be helps to reduces the compression work and achieve higher performance of the vapour compression refrigeration system. Then nozzles are testing at condenser outlet, whereas nozzle inlet diameter equal to discharging tube diameter of condenser and outlet diameter equal to inlet diameter of expansion valve. Additional pressure drop in the nozzle helped to achieve higher performance of the vapour compression refrigeration system. The system is analyzes using the first and second laws of thermodynamics, to determine the refrigerating effect, the compressor work input, coefficient of performance (COP).

Cop Enhancement of Vapour Compression Refrigeration System

This experimental investigation exemplifies the design and testing of diffuser at compressor inlet and nozzle at condenser outlet in vapour compression refrigeration system with the help of R134a refrigerant. The diffuser with divergence angle of 12°,14° and the nozzle with convergent angle 12°,14° are designed for same inlet and outlet diameters. Initially diffusers are tested at compressor inlet diffuser is used with inlet diameter equal to exit tube diameter of evaporator and outlet tube diameter is equal to suction tube diameter of the compressor. Diffuser helps to increases the pressure of the refrigerant before entering the compressor it will be helps to reduces the compression work and achieve higher performance of the vapour compression refrigeration system. Then nozzles are testing at condenser outlet, whereas nozzle inlet diameter equal to discharging tube diameter of condenser and outlet diameter equal to inlet diameter of expansion valve. Additional pressure drop in the nozzle helped to achieve higher performance of the vapour compression refrigeration system. The system is analyzes using the first and second laws of thermodynamics, to determine the refrigerating effect, the compressor work input, coefficient of performance (COP).

Experimental and Theoretical Research on Pressure Drop Changes in a Two-Stage Air Filter Used in Tracked Vehicle Engine

The effect of mineral dust in the air sucked in by an engine on accelerated component wear and reduction in performance was presented. The necessity to use two-stage air filters (multicyclone-paper insert) for military vehicles was shown. The results showed that placing an air filter in the path of the air entering the engine causes an additional pressure drop (air filter resistance increase), which leads to engine power decrease and increased fuel consumption. An analysis of model filter beds’ pressure drop changes (depending on bed parameters, aerosol flow parameters, and dust content) was carried out. It was revealed that it is very difficult to model changes in pressure drop in filter beds for actual conditions that appear during vehicle operation. The air filter pressure drop measurement results of more than 20 tracked vehicles operating in variable air dust concentration conditions were presented. The forms of selected regression models of the “life curve” type, best suited to the actual changes in air filters pressure drop as a function of the vehicle mileage, were determined. Significant differences were found between the same model values for different units of the tested vehicles. The quality of forecasting pressure drop value by selected functions was assessed by extrapolating them to the value of the next measurement and comparing the forecast and actual value. It was found that for the performed experiment, sufficiently good results of experimental data approximation and forecasting were obtained for a simple linear model.

Numerical investigation on the MHD flow characteristics of eutectic lead-lithium alloy in a U-turn duct with different aspect ratios of the connecting channel

In the design and development of liquid breeder blankets, a number of duct geometries are considered, such as the multiple channel, U-turn duct and T-shaped duct. In the presence of the magnetic field, the motion of electrically-conducting liquid metal leads to Megnetohydrodynamic phenomena, as results of the liquid metal flow profile changes inside the flow channels and additional pressure drop of liquid breeder blankets. A three-dimensional liquid-metal (LM) magnetohydrodynamic (MHD) flows in a U-turn duct with large aspect ratio of the duct cross-section of the connecting channel and in a U-turn conduit with manifold in the connecting region is studied, respectively. Here, the effects of the electrical conductivity of the separating wall in the manifold and different Hartmann numbers on the flow features are considered. Since the 3-D currents are induced due to the complicated geometrical flow path, the electrical conductivity of the separating wall plays a key role in the distribution of mass flow rate among the parallel ducts in manifold. Thus, in the present study, the distribution of the mass flow rate is analyzed for different electrical conductivity of the structural walls. Furthermore, since the aim of the optimal design of liquid-metal blanket is to achieve a proper velocity distribution and reduce the pressure drop caused by the flow opposing Lorentz force, the investigation of the effect of the duct geometry on the pressure distribution in this study is significant.

Use of Wire Matrix Inserts in Thermosiphon Reboilers in the Lower Operating Range

AbstractTurbulators are applied to increase the thermal efficiency of heat transfer units. The additional pressure drop can be challenging for the self‐circulation of thermosiphon reboilers. Thus, the effects of hiTRAN®‐wire matrix inserts for the boiling of water and a water/glycerol mixture were investigated herein, using the performance of a thermosiphon reboiler with plain tubes as a reference. The reboiler was operated at sub‐atmospheric pressures, small driving temperature differences, and under flooded conditions. Favorable and unfavorable operating conditions for using inserts were specified. Especially for the water/glycerol mixture, significant improvements of self‐circulation and heat transfer up to six times compared to the plain tube reference were observed, allowing an operation of thermosiphon reboilers at smaller driving temperature differences under sub‐atmospheric pressures.

Static and dynamic evaluation of a novel solution path on asphaltene deposition and drag reduction in flowlines: An experimental study

Asphaltene, as a destructive fraction of crude oil, reduces productivity by deposition in wells, pipelines and porous media and causes additional pressure drop on the fluid flow. The AUT-Force 110 multifunctional additive has been developed for the first time by the team of researchers of this paper, which has been identified as an inhibitor, dispersant and solvent for asphaltene sediment and its effectiveness has previously been proven. In this study, first, two crude oil sample from southwestern fields of Iran were selected. The selection criteria were differences in asphaltene molecular structure. The structure and molecular geometry of asphaltene have been determined using elemental analysis, Fourier-transform infrared spectroscopy (FTIR) and Carbon-13 (C13) nuclear magnetic resonance test. Then asphaltene was coated onto metal powder surface (crude oil pipeline simulator) by means of a unique process. The steel coated with asphaltene was then washed with AUT-Force 110 to determine its effectiveness in separating the asphaltene adsorbed onto the metal surface. SEM images clearly showed that the multifunctional additive, regardless of asphaltene type, was able to change the mechanism of asphaltene adsorption at the metal surface from multilayer to single layer. In addition, Energy-dispersive X-ray spectroscopy (EDX) demonstrated that in the presence of AUT-Force 110, iron (as the main constituent of metal powder) would increase by more than 12% in acidic asphaltene and more than 4% in basic asphaltene. AUT-Force 110 can also remove acidic and basic groups of asphaltene from metal powder surface by altering the electrostatic properties of the surface. The results of the spectroscopy showed that in addition to polar compounds, the multifunctional additive also reduces the amount of aliphatic and paraffinic functional groups at the surface of metal powder. In addition to static conditions, the efficiency of AUT-Force 110 in fluid flow condition was also investigated. For this purpose, two separate laboratory setups were designed and implemented. In the first setup, the surface charge of asphaltene flocs was determined in the presence of an electric field and the results of the zeta potential measurement test were verified. Asphaltene was often observed around the positive electrode (cathode), indicating that the predominant charge of asphaltene samples is negative. However, the higher the number of nitrogenous agents in asphaltene, the lower the amount of asphaltene accumulated around the cathode. In the second setup, a pipeline with accessories was designed to investigate the performance of the AUT-Force 110 as a drag force reducer in the pipeline. The reduction of drag force by AUT-Force 110 occurs with increasing fluid flow rate in the pipe. An increase in the flow rate is equivalent to growth in fluid flow turbulence, which could ultimately provide a better environment for drag reducer to function more efficiently.

Effect of moisture content on flow behavior and resistance characteristics of dense-phase pneumatic conveying

The flow characteristic of high pressure dense-phase pneumatic conveying of pulverized coal is essential to the safe and stable operation of the gasifier. In this paper, the effects of coal moisture content on conveying behavior and resistance characteristics of dense-phase pneumatic conveying were explored. Meanwhile, a model of the additional pressure drop of particles was proposed and compared with the experimental data. The results show that though the resistance and cohesiveness increase with increasing moisture content, its influence is different in dense and dilute phase. In the dense-phase region, the coal with lower moisture content shows a larger solid mass flow rate and solid concentration; while in the dilute-phase region, the moisture content has minor effect on conveying characteristics. For the coal with lower moisture content in dense-phase region, the solid mass flow rate and solid concentration are larger, and the gas velocity has a small effect on solid friction factor, due to its smaller cohesiveness and resistance, which is showed in our experiments and inferred from our model. The additional pressure drop model was proposed for straight pipes and bends, whose parameters are probably effective than the existing parameters in this kind of model, as the deviation in the vertical rise pipe, horizontal pipe and bend pipe is controlled within ±30%, and the corresponding vertical down pipe are controlled within ±40%.

Theoretical research on two-phase flow instability in parallel channels under periodic heaving motion condition

A theoretical model for Density Wave Oscillations (DWOs) flow instability in parallel rectangular channels under periodic heaving motion condition is established with a lumped mathematical model based on homogenous hypothesis. The parallel channel comprises of parallel channels, which consists of entrance section, heating section and riser section, and the upper- and lower plenums guaranteeing the isobaric pressure drop condition between channels. The lumped model consists of boiling channel model, pressure drop model, parallel channel model, additional pressure drop model introduced by periodic heaving motion and the constitutive model and the final nonlinear ordinary differential equations are solved by Gear method. The model is validated with experimental data of a single channel with constant pressure drop and those of twin-tube-channel and twin-rectangular-channel flow instability experiment under static condition, respectively. Afterwards the flow instability in twin-rectangular channel system is studied under periodic heaving motion condition. The effects of amplitude and frequency of heaving motion are examined through the parameter plane of the subcooling and phase change number and the threshold power for flow instability. The results show that the effect of amplitude on flow instability can be divided into three regions in which thermal hydraulic parameters, heaving motion or both of them together dominant the flow instability; the frequency of heaving motion strongly effects the threshold power when it is identical to that of the DWOs, which can be explained by resonance between the heaving motion and DWOs. And this effect is even stronger when the asymmetric throttling and heating condition is introduced.

Non-Linear Qualitative Dynamic Analysis of Supercritical Water-Heated Channels under External Vertical Accelerations

Employing the external force method to regard seismic impact and the three-region methodology to analyze the supercritical heated channel, a non-linear dynamic model was developed to investigate the transient characteristics of single channel or parallel channels under the impacts of vertical sinusoidal and seismic accelerations. The present model was validated against the experimental data, which could suitably estimate the additional pressure drop caused by the vertical vibrations. The influences of parameters on the seismic-induced oscillation conducted in a supercritical heated channel indicated that a longer heated length, uprating operation power and a larger outlet loss coefficient all exhibit unstable effects, while the increase of inlet loss coefficient, a larger tube diameter and a lower inlet fluid temperature would tend to stabilize the system. Moreover, the supercritical fluid would present a high natural frequency in the very small NP-SUB region. The parametric effects on the parallel channel system are related to the inherent stability nature of initial state and the interactions among channels. The more uneven heat flux distribution among channels would cause a larger vibration-induced oscillation. In particular, when it is combined with the resonance effect, the system may exhibit much larger oscillations than in the case of non-resonance.

Hydrate predictions on the China-Russia eastern gas pipeline during the pipeline goes into production

The China-Russia eastern gas pipeline has the characteristics of large pipe diameter and high pressure. During the pipeline goes into production, the temperature along the pipeline was low, and the conditions of low temperature and high pressure brought the risk of hydrate formation. Based on the multiphase flow theory and the CSMHyK hydrate growth kinetic model, this paper studied the hydrate formation region, the amount of hydrate formed and the influence of hydrate formation on the temperature drop and pressure drop of the China-Russia eastern gas pipeline in the first winter the pipeline goes into production. The results show that in the first winter the pipeline goes into production when the water content is more than 150 mg/kg the hydrate formation risk exists in the pipeline. Hydrate accumulates mainly in the ascending part of the low-lying pipe section, and the greater the height difference of the pipe section, the more hydrate accumulation. In the stage of mass hydrate formation, the temperature in the pipeline will rise due to hydrate formation, but when hydrate growth reaches equilibrium, the temperature in the pipeline is mainly controlled by the external soil temperature. In addition, a large amount of hydrate accumulation will generate a throttling effect, which will lead to increased temperature drop and pressure drop of the pipeline. When the water content is 350 mg/kg, the maximum additional pressure drop generated by hydrate aggregation is 2.27MPa.

Reducing the systematic error of the average fluid flow rate in axisymmetric computer model of piezoelectric micropump

Mathematical and computer models of an axisymmetric coupled problem of interaction of a fluid and an elastic body for the solving partial differential equations by the finite element method FreeFem ++ software are proposed. In these models, periodic vibrations of annular piezoelectric actuators placed on an elastic tube of circular cross-section lead to radial deformations of the tube. With a synchronous oscillation of the system of piezoelectric actuators, the average fluid flow rate is zero. An asymmetric oscillation pattern (micropump mode) results in a nonzero average flow rate. Two types of boundary conditions are considered in the region of contact between the piezoelectric drive and the tube — Dirichlet and Neumann. The computer model was tested for unsteady fluid flow induced by a pressure gradient applied along the pipe with a circular cross section. With synchronous oscillation of piezoelectric actuators, a nonzero average fluid flow is a systematic error. This value was compared with the asymmetric oscillation pattern of piezoelectric actuators to determine the contribution of the systematic error to the pump-generated fluid flow rate. Based on the fluid flow velocity profile and the results of profiling the program code, the optimal parameters of the computational meshes for the channel (dense uniform) and tube walls (nonuniform, consistent with the velocity profile and reconstructing at each time step) were determined, which reduce the magnitude of the systematic error. The main way to reduce the error is to increase the density of the computational mesh, which leads to an increase in the required computing resources. An alternative method is proposed for reducing the systematic error due to an additional pressure drop applied to the channel. Depending on the type of boundary conditions and the number of piezoelectric actuators, this method can reduce the systematic error by 1 − 2 orders of magnitude without increasing the simulation time.

Improving the performance of PV/T systems by using conical-leaf inserts in the coolant tubes

The use of inserts to increase mixing and heat transfer in heat exchangers and solar collectors has gained significant recent attention, but not for photovoltaic thermal (PV/T) systems. We describe a 3D numerical study of a PV/T module with conical-leaf inserts using computational fluid dynamics. The numerical solution was validated against available experimental data. Inserts represent a trade-off as the increased mixing and heat transfer causes an additional pressure drop which requires increased pumping power. The trade-off shows that our base case of the conical-leaf insert increases the Nusselt number by a factor of nearly two compared to the plain tube without insert, which is attributed to the increased mixing and redeveloped thermal boundary. Consequently, it leads to improvement in thermal and electrical efficiencies compared to a PV/T module without insert by 12% and 2%, respectively. Moreover, the conical-leaf insert had a negligible effect on the pump power as compared to the electrical power output of the module and the cell temperatures were more uniform than when there was no insert. We then evaluate the performance of the PV/T module with different insert designs and arrangements, and operating conditions. Among the geometrical parameters, the best overall efficiency of 84.2% occurred when the leaf angle was 360°, in other words, when it turns into a ring. Over the range of operating conditions that we studied, the reduction of the PV cell temperature with inserts is in the range of 2–7 K. This, in turn, increases the thermal efficiency and electrical efficiency by 10.2–14.1%, and 0.9–3.4% compared to the plain tube, respectively.

Influence of Pre-Turbine Small-Sized Oxidation Catalyst on Engine Performance and Emissions under Driving Conditions

The earlier activation of the catalytic converters in internal combustion engines is becoming highly challenging due to the reduction in exhaust gas temperature caused by the application of CO2 reduction technologies. In this context, the use of pre-turbine catalysts arises as a potential way to increase the conversion efficiency of the exhaust aftertreatment system. In this work, a small-sized oxidation catalyst consisting of a honeycomb thin-wall metallic substrate was placed upstream of the turbine to benefit from the higher temperature and pressure prior to the turbine expansion. The change in engine performance and emissions in comparison to the baseline configuration are analyzed under driving conditions. As an individual element, the pre-turbine catalyst contributed positively with a relevant increase in the overall CO and HC conversion efficiency. However, its placement produced secondary effects on the engine and baseline aftertreatment response. Although small-sized monoliths are advantageous to minimize the thermal inertia impact on the turbocharger lag, the catalyst cross-section is in trade-off with the additional pressure drop that the monolith causes. As a result, the higher exhaust manifold pressure in pre-turbine pre-catalyst configuration caused a fuel consumption increase higher than 3% while the engine-out CO and HC emissions did around 50%. These increments were not completely offset despite the high pre-turbine pre-catalyst conversion efficiency (>40%) because the partial abatement of the emissions in this device conditioned the performance of the close-coupled oxidation catalyst.

Phase separation evaporator using pin-fin-porous wall microchannels: Comprehensive upgrading of thermal-hydraulic operating performance

Microchannel evaporator has intrinsic drawback of two-phase flow instabilities with large pressure drop that is induced from bubble blockage in microchannels. Here, we propose a new concept of phase-separation evaporator, in which flow instabilities can be completely suppressed by using gradient pin-fin-porous wall microchannels. The phase-separation concept stems from the self-driven motion of nucleated bubbles from pin-fin region to bare channel region. Vapor bubbles release from porous wall at a high frequency of ~1000 Hz that ensures bare channels not totally wrapped by vapor. Thus, ultra-stable flow and heat transfer can be achieved in a wide range of operating parameters: Tin = 81.9~92.6 °C, Pin = 110.57~219.77 kPa, G = 112~264 kg/m2s, q = 20.79~292.82 kW/m2 and xout = 0.005~0.318. Both convective evaporation in bare channels and bubble nucleation in porous walls contribute to enhanced performance. Heat transfer coefficients are not changed as the Bo numbers ranging from 6.91 × 10–5 to 7.44 × 10–4. This is because when heat flux and/or mass flux is changed, one mechanism is strengthened while the other mechanism is weakened to achieve constant overall heat transfer coefficient. This heat transfer mechanism is different from that in conventional microchannels in which nucleation mechanism dominates at small Bo while convective mechanism dominates at large Bo. With mass fluxes in the range of 112 ~264 kg/m2s, pressure drops are not changed versus mass fluxes at a given heat flux, which are caused by the thermal driving effect in porous walls. Stable heat transfer coefficients and pressure drops ensure flexible selection of running parameters. The evaporator can operate at smaller mass flow rates, as long as dry-out does not occur, it can also operate at larger flow rates without accompanying additional pressure drops.

Wettability alteration and enhanced gas condensate recovery by treatment of carbonate reservoir rock using supercritical R134A and R404A gases

The pressure drop around the well in the production from a gas condensate reservoir causes the formation of condensate in the area before it reaches the well and surface space. This condensate and occasionally water in the porous medium can block the well and create an additional pressure drop. Studies show that the chemical treatment of this area eliminates the problem by altering the reservoir rock wettability toward a moderate and strong gasphilicity. For this purpose, fluoropolymers-, fluorosurfactants-, and fluorochemicals-coated nanoparticles can be used. In this work, we have studied two types of fluoride gas namely R134A and R404A, which are widely used in refrigeration industry as refrigerant gases, perfumery, and industrial detergents. The basis of this study was the aging of rock samples in thin sections and plugs in these two gases at different pressures above the critical pressures of them at 70 °C at different times and then conducting the contact angle experiments by placing the drop of water and condensate on the cross sections and then performing imbibition tests using plugs. The results show that in addition to the efficiency of both gases in wettability alteration to gasphilic, the gasphilic intensity obtained at constant temperature depends on the pressure and the aging time of the samples.

Effect of water saturation on the role of polymer elasticity during heavy oil recovery

During enhanced oil recovery, polymers are used to improve the sweep efficiency during chemical injection process. Polymers are mainly characterized based on their viscoelasticity response; however, the role of polymer elasticity on heavy oil considering the effect of water saturation in porous media has not been well explored. In this work, four blends of polyacrylamide polymer solutions with similar molecular weight and shear viscosity but different bulk elasticity (due to different molecular weight distribution) were used. A series of flooding experiments were performed using a cylindrical core sand pack saturated with heavy oil designed to simulate linear flow. The flow rate was selected based on the shear rate range present in field applications. Effect of elasticity during the injection of these polymer solutions were compared during tertiary recovery experiments in terms of oil recovery and residual resistance factor at different initial water-flood volumes. The results indicate that the effect of polymer elasticity was more profound in tertiary mode with higher water saturation. An additional pressure drop was required to push a higher elastic solution. The required pressure drop to push the polymer solutions increased with water saturation.