Open Access
ARTICLE
Dongkwon Han, Sunil Kwon*
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.3, pp. 411-424, 2020, DOI:10.32604/fdmp.2020.08388
Abstract This paper presents the development and application of a production
data analysis software that can analyze and forecast the production performance
and reservoir properties of shale gas wells. The theories used in the study were
based on the analytical and empirical approaches. Its reliability has been con-
firmed through comparisons with a commercial software. Using transient data
relating to multi-stage hydraulic fractured horizontal wells, it was confirmed that
the accuracy of the modified hyperbolic method showed an error of approximately
4% compared to the actual estimated ultimate recovery (EUR). On the basis of the
developed model, reliable productivity forecasts have… More >
Open Access
ARTICLE
Jing Sun1,2,3,*, Dehua Liu1,2,3, Xiang Zhu1,2,3, Wenjun Huang1,2,3, Liang Cheng1,2,3
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.3, pp. 425-440, 2020, DOI:10.32604/fdmp.2020.08531
Abstract Low permeability tight sandstone reservoirs have a high filtrational
resistance and a very low fluid flow rate. As a result, the propagation speed of
the formation pressure is low and fluid flow behaves as a non-Darcy flow, which
typically displays a highly non-linear behavior. In this paper, the characteristics
and mechanism of pressure propagation in this kind of reservoir are revealed
through a laboratory pressure propagation experiment and through data from an
actual tight reservoir development. The main performance mechanism is as follows: A new pressure cage concept is proposed based on the pressure variation
characteristics of the laboratory experiments.… More >
Open Access
ARTICLE
Latifa M. Al-Balushi, M. M. Rahman*
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.3, pp. 441-463, 2020, DOI:10.32604/fdmp.2020.08551
Abstract In the present paper, the effect of the heat flux distribution on the natural convective flow inside a square cavity in the presence of a sloping magnetic
field and magnetic nanoparticles is explored numerically. The nondimensional
governing equations are solved in the framework of a finite element method
implemented using the Galerkin approach. The role played by numerous model
parameters in influencing the emerging thermal and concentration fields is examined; among them are: the location of the heat source and its lengthH*, the magnitude of the thermal Rayleigh number, the nanoparticles shape and volume
fraction, and the Hartmann number. It… More >
Open Access
ARTICLE
Chunsheng Wang*, Dongxing Shang
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.3, pp. 465-473, 2020, DOI:10.32604/fdmp.2020.08828
Abstract Electroosmosis is an effective method for liquid mixing. It is associated
with the motion of a liquid in a microchannel induced by an applied electric field.
In this manuscript, a numerical model is elaborated and implemented for the case
of a straight channel with a single electrode pair. In particular, the Navier-Stokes
equation combined with the Convection-diffusion and Helmholtz-Smoluchowski
equation are used to simulate the resulting flow field. The influence of various
electrode parameters on the mixing efficiency and the related mechanisms are
investigated. The numerical results show that a pair of eddies are produced alternately by the changing electric… More >
Open Access
ARTICLE
Yushan Liu1,2, Yubin Su3, Zhenhua Wu4, Wei Luo1,2, Ruiquan Liao1,2,*
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.3, pp. 475-488, 2020, DOI:10.32604/fdmp.2020.08896
Abstract The lifting efficiency and stability of gas lift well are affected by the socalled slippage-loss effect in gas-liquid two-phase flow. The existing studies on
this subject have generally been based on vertical and horizontal wells. Only a
few of them have considered inclined pipes. In the present work a new focused
study is presented along these lines. More specifically, we use the non-slip pressure drop model with Flanigan’s fluctuation correction coefficient formula
(together with the parameters of slippage density, slippage pressure drop and slippage ratio) to analyze the influence of the inclination angle on slippage loss for
different conditions (different… More >
Open Access
Daoming Shen1,2,*, Chao Gui1, Jinhong Xia1, Songtao Xue2,3
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.3, pp. 489-500, 2020, DOI:10.32604/fdmp.2020.08969
Abstract The performances of a refrigeration unit relying on compressors working in parallel have been investigated considering the influence of the compressor
volumetric efficiency and isentropic efficiency on the compression ratio. Moreover, the following influential factors have been taken into account: evaporation
temperature, condensation temperature and compressor suction-exhaust pressure
ratio for different opening conditions of the compressor. The following quantities
have been selected as the unit performance measurement indicators: refrigeration
capacity, energy efficiency ratio (COP), compressor power consumption, and
refrigerant flow rate. The experimental results indicate that the system refrigeration capacity and COP decrease with a decrease in evaporation temperature,
increase… More >
Open Access
ARTICLE
Xingkai Zhang, Xuan Zhang, Ruiquan Liao*
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.3, pp. 501-512, 2020, DOI:10.32604/fdmp.2020.09012
Abstract In order to clarify the influence of the instrument’s own drag on the
temperature distribution in the horizontal gas wellbore in temperature logging.
By constructing an indoor gas-liquid two-phase horizontal tube flow platform,
the effects of the drag speed of the instrument on the temperature distribution
in the wellbore were studied in the single-phase gas and gas-liquid two phases.
In addition, during the process of instrument dragging, the influence of different
perforation cluster opening methods and wellbore inclination on temperature distribution was also studied. The results show that the temperature fluctuation is
reduced at higher drag speeds; Under a certain… More >
Open Access
ARTICLE
Qiping Chen*, Haoyu Sun, Ning Wang, Zhi Niu, Rui Wan
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.3, pp. 513-524, 2020, DOI:10.32604/fdmp.2020.09375
Abstract The possibility to enhance the stability and robustness of electrohydraulic brake (EHB) systems is considered a subject of great importance in
the automotive field. In such a context, the present study focuses on an actuator
with a four-way sliding valve and a hydraulic cylinder. A 4-order nonlinear mathematical model is introduced accordingly. Through the linearization of the feedback law of the high order EHB model, a sliding mode control method is
proposed for the hydraulic pressure. The hydraulic pressure tracking controls
are simulated and analyzed by MATLAB/Simulink soft considering separately
different conditions, i.e., a sine wave, a square wave and… More >
Open Access
ARTICLE
Tianyu Xu, Lixiang Zhang*
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.3, pp. 525-536, 2020, DOI:10.32604/fdmp.2020.09618
Abstract In this article, computational fluid dynamics (CFD) are used to explore
the dynamics of water transport inside the pitted thickening of a plant xylem vessel. A pitted thickening model combined with the Bernoulli equation is used to
analyze the influence of various factors (namely, the inner diameter, thickening
width, thickening height, thickening spacing, number of laps and adjacent pit
axial rotation). The pressure drop and the flow resistance coefficient are the variable parameters for our analysis. The results show that these two parameters are
proportional to the thickening height and thickening width, and inversely proportional to the inner diameter, thickening… More >
Open Access
ARTICLE
Chong Liu, Yang Du, Jianjun Liang, Hong Meng, Jian Wang, Peili Zhang*
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.3, pp. 537-547, 2020, DOI:10.32604/fdmp.2020.09119
（This article belongs to this Special Issue: EFD and Heat Transfer II)
Abstract Gas explosion is a process involving complex hydrodynamics and chemical reactions. In order to investigate the interaction between the flame behavior
and the dynamic overpressure resulting from the explosion of a premixed gasoline-air mixture in a confined space, a large eddy simulation (LES) strategy
coupled with sub-grid combustion model has been implemented. The considered
confined space consists of a long duct and four branches symmetrically distributed on both sides of the long duct. Comparisons between the simulated and
experimental results have been considered with regard to the flame structure,
flame speed and overpressure characteristics. It is shown that the explosion… More >
Open Access
ARTICLE
Guolin Li*
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.3, pp. 549-559, 2020, DOI:10.32604/fdmp.2020.09219
（This article belongs to this Special Issue: EFD and Heat Transfer II)
Abstract The rational design of heating ventilation and air conditioning systems is
an important means to achieve energy conservation and sustainable development.
The simulation of air-conditioning systems with finite element methods has gradually become an important auxiliary means of complex airspace design. In this paper,
a k-ε turbulence model is used to conduct 3D simulations and optimize the summer
air conditioning system of a lecture hall. Various conditions are considered in terms
of fresh air temperature and flow rate towards the end to improve comfort. The
approach used in this paper could also be used in the future as an auxiliary… More >
Open Access
ARTICLE
Jinyu Ren, Dezhi Xu, Jing Xu*
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.3, pp. 561-572, 2020, DOI:10.32604/fdmp.2020.09791
（This article belongs to this Special Issue: EFD and Heat Transfer II)
Abstract Submarine maneuverability has been analyzed by means of computational fluid dynamics (CFD). This approach provides an alternative, accurate,
and cost-effective method for simulating actual flow. The numerical results show
that the numerical simulation of the viscous flow related to a moving submarine
based on the RANS equation with a relevant turbulence model can not only provide rich flow field details such as flow separation, but also accurately predict its
hydrodynamic performance. The present study indicates that CFD can be used to
forecast the submarine’s maneuverability in the initial design stage. The present
results will be used in the future as… More >
Open Access
ARTICLE
Ke Sun, Da Li, Hao Liu, Shuzhan Bai*
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.3, pp. 573-584, 2020, DOI:10.32604/fdmp.2020.09591
（This article belongs to this Special Issue: High-Speed and High-Temperature Flows)
Abstract In order to effectively implement DPF (Diesel Particulate Filters)
regeneration control, thermal management of exhaust products before and inside
Diesel Oxidation Catalyst (DOC) is necessary. In the present study, the Influence
of the intake throttle valve and late post injection process on temperature rise
inside DOC is analyzed through engine bench tests. The steady experiment results
show that adjustment of the intake throttle valve can effectively increase exhaust
temperature before DOC; in particular, with intake throttle valve opening at 20%,
temperature before DOC can be increased by about 170°C with respect to the full
opening. An increase in the late… More >
Open Access
ARTICLE
Lin Wang1, Chunguo An2, Nini Wang2, Yaming Ping1, Kun Wang1, Ming Gao1,*, Suoying He1
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.3, pp. 585-600, 2020, DOI:10.32604/fdmp.2020.09611
（This article belongs to this Special Issue: High-Speed and High-Temperature Flows)
Abstract Numerical simulation are conducted to explore the characteristics of the
axial inflow and related aerodynamic noise for a large-scale adjustable fan with
the installation angle changing from −12° to 12°. In such a range the maximum
static (gauge) pressure at the inlet changes from −2280 Pa to 382 Pa, and the minimum static pressure decreases from −3389 Pa to −8000 Pa. As for the axial intermediate flow surface, one low pressure zone is located at the junction of the
suction surface and the hub, another is located at the suction surface close to
the casing position. At the outlet boundary,… More >
Open Access
ARTICLE
Jingying Wang, Fangzhou Han*, Li Lei, Chunhian Lee
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.3, pp. 601-613, 2020, DOI:10.32604/fdmp.2020.09624
（This article belongs to this Special Issue: High-Speed and High-Temperature Flows)
Abstract Accurate aerodynamic heating prediction is of great significance to current manned space flight and deep space exploration missions. The temperature in
the shock layer surrounding the reentry vehicle can reach up to 10,000 K and
result in remarkable thermochemical nonequilibrium, as well as considerable
radiative heat transfer. In general, high-temperature flow simulations coupled with
thermal radiation require appropriate numerical schemes and physical models. In
this paper, the equations governing hypersonic nonequilibrium flow, based on a
three-temperature model combined with a thermal radiation solving approach,
are used to investigate the radiation effects in the reentry shock layer. An axisymmetric spherical case… More >
Open Access
ARTICLE
Jiyuan Zhang1, Linbo Wang1, Chengqiang Zhang1, Shuzhan Bai2,*
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.3, pp. 615-621, 2020, DOI:10.32604/fdmp.2020.09654
（This article belongs to this Special Issue: High-Speed and High-Temperature Flows)
Abstract The influences of steam and sulfide on the efficiency of NOx reduction
using ammonia (NH3) over the nanometer-class V-W/Ti catalyst in conditions of
high temperature is experimentally investigated using a steady-flow reactor. The
results showed that selective catalytic reduction (SCR) is inhibited by H2O at
low temperature, but higher NO conversion efficiency is achieved at high temperature since the reaction of NH3 oxidized by O2 to NOx is inhibited by H2O.
The activity of SCR is promoted by SO2 in the temperature range of 200~500°
C, the NO conversion efficiency was improved to 98% from 94% by adding
SO2. SCR… More >
Open Access
ARTICLE
Qingyun Yan1, You Li2, Yuanhong Zhu3, Kui Cheng3, Xueli Huang3, Cong Qi3, Xuemin Ye2,*
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.3, pp. 623-636, 2020, DOI:10.32604/fdmp.2020.09669
（This article belongs to this Special Issue: High-Speed and High-Temperature Flows)
Abstract A hot primary-air pipe system is the bridge connecting an air-preheater
with a coal mill in power generation stations. The effective geometrical configuration of the pipe network greatly affects the air flow distribution and consequently
influences the safe and economic operation of milling systems in power stations.
In order to improve the properties of the air flow, in the present work the SIMPLEC method is used to simulate numerically the flow field for the original layout
of the system. As a result, the internal mechanisms influencing the uneven pressure drop in each branch are explored and three optimization schemes are… More >
Open Access
ARTICLE
Yongkang Zheng1,2,*, Chao Yan1
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.3, pp. 637-650, 2020, DOI:10.32604/fdmp.2020.09694
（This article belongs to this Special Issue: High-Speed and High-Temperature Flows)
Abstract The flow field inside the combustor of a scramjet is highly complicated
and the related turbulent Prandtl and Schmidt numbers have a significant impact
on the effective numerical prediction of such dynamics. As in many cases
researchers set these parameters on the basis of purely empirical laws, assessing
their impact (via parametric numerical simulations) is a subject of great importance. In the present work, in particular, two test cases with different characteristics are selected for further evaluation of the role played by these non-dimensional
numbers: Burrows-Kurkov case and DLR case. The numerical results indicate
that these parameters influence ignition location.… More >
Open Access
ARTICLE
Shengyang Feng1,2,3,*, Dongbo Xiong4, Guojie Chen5, Yu Cui1, Puxin Chen1
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.3, pp. 651-663, 2020, DOI:10.32604/fdmp.2020.07981
（This article belongs to this Special Issue: The Progress in Building Indoor Air Quality: Indoor Airflow and Pollutant Control)
Abstract Convection and diffusion are the main factors affecting radon migration. In this paper, a coupled diffusion-convection radon migration model is presented taking into account turbulence effects. In particular, the migration of radon
is simulated in the framework of the k-ε turbulence model. The model equations
are solved in a complex 3D domain by the finite element method (FEM). Special
attention is paid to the case study about radon migration in an abandoned air
defense shelter (AADS). The results show that air convection in a confined space
has a great influence on the radon migration and the radon concentration is inversely… More >
Open Access
ARTICLE
Bin Zhang*, Yongzhen Wang, Jiaqing Zheng, Dan Liu
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.3, pp. 665-674, 2020, DOI:10.32604/fdmp.2020.09314
（This article belongs to this Special Issue: The Progress in Building Indoor Air Quality: Indoor Airflow and Pollutant Control)
Abstract The relationship among the working temperature, pressure and current
density of a Solid oxide fuel cell (SOFC) and its output power and efficiency are
analyzed in the framework of a theoretical model able to provide, among other
things, the volt ampere characteristic curve. In particular, following the principle
of temperature matching and cascade utilization, we consider a gas turbine (GT)
and a LiBr absorption chiller to recycle the high-grade exhaust heat produced by
the considered SOFC. This distributed total energy system is set up with the intent
to meet typical needs of buildings for cooling, heating and power (CCHP). The… More >
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