Peristaltic Flow of a Two-Layer System in a Poroflexible Tube

2008 ◽  
Vol 11 (1) ◽  
pp. 51-71 ◽  
Author(s):  
Manoranjan Mishra ◽  
A. Ramachandra Rao
Keyword(s):  
Peristaltic Flow ◽  
Layer System

Discrete element method to model cracking for two layer systems

TAPPI Journal ◽  
2019 ◽  
Vol 18 (2) ◽  
pp. 101-108
Author(s):  
Daniel Varney ◽  
Douglas Bousfield
Keyword(s):  
Discrete Element Method ◽  
Flexural Modulus ◽  
Single Layer ◽  
Discrete Element ◽  
Flexural Stress ◽  
Layer System ◽  
Three Point Bending ◽  
Moving Force ◽  
Coating Layers ◽  
Element Method

Cracking at the fold is a serious issue for many grades of coated paper and coated board. Some recent work has suggested methods to minimize this problem by using two or more coating layers of different properties. A discrete element method (DEM) has been used to model deformation events for single layer coating systems such as in-plain and out-of-plain tension, three-point bending, and a novel moving force picking simulation, but nothing has been reported related to multiple coating layers. In this paper, a DEM model has been expanded to predict the three-point bending response of a two-layer system. The main factors evaluated include the use of different binder systems in each layer and the ratio of the bottom and top layer weights. As in the past, the properties of the binder and the binder concentration are input parameters. The model can predict crack formation that is a function of these two sets of factors. In addition, the model can predict the flexural modulus, the maximum flexural stress, and the strain-at-failure. The predictions are qualitatively compared with experimental results reported in the literature.

DISSIPATIVE HEAT TRANSFER IN SISKO FLUID PERISTALTIC FLOW THROUGH A CYLINDRICAL TUBE WITH NONLINEAR SLIP

2015 ◽  
Vol 46 (7) ◽  
pp. 643-656 ◽  
Author(s):  
Obaid Ullah Mehmood ◽  
Norzieha Mustapha ◽  
Sharidan Shafie ◽  
Muhammad Qasim
Keyword(s):  
Heat Transfer ◽  
Cylindrical Tube ◽  
Peristaltic Flow ◽  
Sisko Fluid ◽  
Dissipative Heat ◽  
Flow Through

LEGAL ISSUES REGARDING IMPOSITION OF E-FORM D AS A BASIS FOR DETERMINATION OF PREFERENTIAL TARIFFS IN ATIGA

2020 ◽  
Vol 4 (2) ◽  
Author(s):  
Aditya Subur Purwana ◽  
Wahyu Hidayat ◽  
Mursal Maulana
Keyword(s):  
Research Method ◽  
Descriptive Analysis ◽  
Legal Issues ◽  
Legal Certainty ◽  
Layer System ◽  
Legal Provisions ◽  
Directorate General ◽  
Domestic Law

Submission of Certificate of Origin (e-Form D) is conducted through a three-layer system named ASW Gateway, LNSW, and CEISA has raised issues related to the period/time of receipt of e-Form D given by customs authorities for the purposes of charging preferential tariffs in the ATIGA scheme. This article aims to analyze the legal certainty in submitting e-Form D to the customs authorities in the importing country, in this case, the Directorate General of Customs and Excise for the purpose of charging preferential tariffs, so that it can be in line with the presentation principle based on the ATIGA OCP and Indonesian domestic legal provisions. The research method used is a normative juridical approach with descriptive analysis and normative qualitative to draw conclusions. Based on the research, it was concluded that with regard to the submission of e-Form D, Customs and Excise Officials must have confidence based on factual evidence to determine whether the principle of submission of e-Form D has been accomplished or refused when an interruption in the ASW Gateway, LNSW or CEISA happened so the Customs Officer and Excise can determine tariffs based on OCP as well as domestic law in force in Indonesia.Keywords: ATIGA, Customs Authority, Directorate General of Customs and Excise, e-Form D, Tariffs Preference.ABSTRAK: Penyerahan SKA e-Form D dilakukan melalui tiga layer system yakni ASW Gateway, LNSW, dan CEISA memunculkan permasalahan terkait dengan jangka waktu/saat diterimanya e-Form D oleh otoritas kepabeanan untuk kepentingan pengenaan tarif preferensi dalam skema ATIGA. Penelitian bertujuan menganalisis kepastian hukum dalam penyerahan e-Form D ke otoritas kepabeanan di negara importir, dalam hal ini Direktorat Jenderal Bea dan Cukai untuk kepentingan pengenaan tarif preferensi, sehingga dapat sejalan dengan prinsip presentasi berdasarkan OCP ATIGA dan ketentuan hukum domestik Indonesia. Metode penelitian dilakukan dengan pendekatan yuridis normatif secara deskriptif analisis dan penarikan kesimpulan secara normatif kualitatif. Berdasarkan penelitian, disimpulkan bahwa berkenaan dengan penyerahan e-Form D, Pejabat Bea dan Cukai harus memiliki keyakinan berdasarkan bukti faktual untuk menentukan apakah prinsip penyerahan e-Form D sudah dipenuhi/tidak ketika terjadi gangguan pada ASW Gateway, LNSW atau CEISA sehingga Pejabat Bea dan Cukai dapat menentukan tarif berdasarkan OCP maupun hukum domestik yang berlaku di Indonesia. Kata Kunci: ATIGA, Direktorat Jenderal Bea dan Cukai, e-Form D, Otoritas Kepabeanan, Tarif Preferensi. 

Peristaltic flow of a Jeffery fluid over a porous conduit in the presence of variable liquid properties and convective boundary conditions

2019 ◽  
Vol 6 (2) ◽  
Author(s):  
G. Manjunatha ◽  
C. Rajashekhar ◽  
K. V. Prasad ◽  
Hanumesh Vaidya ◽  
Saraswati
Keyword(s):  
Boundary Conditions ◽  
Frictional Force ◽  
Variable Viscosity ◽  
Pressure Rise ◽  
Velocity Slip ◽  
Peristaltic Flow ◽  
Physical Parameters ◽  
Convective Boundary Conditions ◽  
Convective Boundary ◽  
Closed Form Solutions

The present article addresses the peristaltic flow of a Jeffery fluid over an inclined axisymmetric porous tube with varying viscosity and thermal conductivity. Velocity slip and convective boundary conditions are considered. Resulting governing equations are solved using long wavelength and small Reynolds number approximations. The closed-form solutions are obtained for velocity, streamline, pressure gradient, temperature, pressure rise, and frictional force. The MATLAB numerical simulations are utilized to compute pressure rise and frictional force. The impacts of various physical parameters in the interims for time-averaged flow rate with pressure rise and is examined. The consequences of sinusoidal, multi-sinusoidal, triangular, trapezoidal, and square waveforms on physiological parameters are analyzed and discussed through graphs. The analysis reveals that the presence of variable viscosity helps in controlling the pumping performance of the fluid.

The pseudomalachite-ludjibaite-reichenbachite conundrum: OD description

2019 ◽  
Vol 57 (5) ◽  
pp. 571-581
Author(s):  
Emil Makovicky
Keyword(s):  
Crystal Structures ◽  
Current Knowledge ◽  
The Other ◽  
Crystal Chemical ◽  
Layer System ◽  
Coordination Polyhedra

Abstract Crystal structures of the three polymorphs of Cu5(PO4)2(OH)4, namely pseudomalachite, ludjibaite, and reichenbachite, can be described as being composed of rods perpendicular to their crystal-chemical layering. Two different sorts of rods can be defined. Type 1 rods share rows of Cu coordination polyhedra, forming a series of slabs. Slab boundaries and slab interiors represent alternating geometric OD layers of two kinds, with layer symmetries close to P21/m and , which make up two different stacking schemes of geometric OD layers in the structures of ludjibaite and pseudomalachite. Such OD layers, however, are not developed in reichenbachite. Type 2 rods are defined as having columns of PO4 tetrahedra in the corners of the rods. In the Type 2 slabs composed of these rods, geometric Pg OD layers of glide-arrayed tetrahedra alternate with more complex OD layers; in ludjibaite this system of layers is oriented diagonally with respect to the Type 1 OD layer system. Two different OD stackings of Type 2 OD layers form the ludjibaite and reichenbachite structures but not that of pseudomalachite. Thus, ludjibaite might form disordered intergrowths with either of the other two members of the triplet but reichenbachite and pseudomalachite should not form oriented intergrowths. Current knowledge concerning formation of the three polymorphs is considered.

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