1. Introduction
Third-grade fluids fit into the category of well-ordered flowing-particles. These have thermo-viscoelastic properties and are amongst the non-Newtonian fluids (NNF) originated from the viscous constituents and elastic materials. Some of their specimens are polymeric-paints, DNA fluids, bio-organic solutions, and other synthetic materials. Polymeric fluids are practically ubiquitously exist and are used as thin layer deposition materials. Although these organic solutions and colloids demonstrate thermo-viscoelastic behavior. For these coating systems, applied stress takes into the mathematical relationship that is not simply existing in a single equation as described in [
1,
2,
3,
4,
5]. In this work, Carapau et al. [
2] based constitutive model for a third-order fluids is presented. In the present order, beta (β) is taken as a third-order type material factor. Phenomenaof shear thickening or shear thinning are largely governed by its mathematical assessment. If material factor beta is larger than zero, the physical system performs similar to a shear thickening substance. In caseswhere thematerial factor beta is a smaller than zero, the physical system acts similar to shear thinning substance.Liquid properties of blade surface protection coatings are mesmerizing, mainly owing to significant engineering solicitations. Application of coating to blade is a progression through which polymeric-particle is coated uninterruptedly to the non-stationery web, and micro-coating thickness is applied on the inflexible part. Blade coatings are largely castoff in broadsheet coats, as it delivers promising evenness to the broadsheets. Other solicitations contain metal oxide based coatings on magnetic recording or adhesive tape, in addition to, suspension glaze on photo layers. Many researchers [
2,
3,
4,
5,
6,
7] investigated coating flows of Newtonian fluids. Most liquids castoff in manufacturing and mechanical applications have non-linear mathematical behaviors between applied pressure and induced deformation. Most of surface protection coatings belong to NNF. Non-Newtonian category liquids are categorized bestowing to their constitutive models. Applied pressure or stress in case of these liquids is a non-linear strain, and proceeding for the answers of these models isnot so straightforward. This is applicable and correct for both exact and for approximate results. It has been found that a second-order liquids do not exhibit the shear thinning or thickening tendency, TGF can exhbit such occurrences. TGF model characterizes inconclusively effort for all-inclusive explanation as NNF presentationowing to the prominence, here we deliberate the TGF based surafce coating model. Basics of thermionics and stability of TGF have been given in [
8].
Some readings about research work in coating efficaciously indulge the non-linear work and their comparisons in leading TGF [
8,
9,
10,
11,
12,
13,
14,
15,
16,
17,
18]. Sullivan et al [
12] premeditated the coating depth in surface coating size/width of TGF by implementing lubrication estimates with numerical and investigational outcomes for NNF. The influence of elasto-plastic material of blade surface protector with weaker viscoelastic fluids has been investigated as well in [
13]. The performance of power-law for liquid in surface protector thin film-geometry has been studied with its behaviorfor pressure dissemination [
14].
Hwang [
15] and Dien et al. [
16] also premeditated NNF in the blade thin film and projected estimated stream studies, Maxwellian flow model in surface protection layer, and studied the fragile viscoelastic performance. This investigation articulates the statement that viscoelastic characteristics of TGF may affect pressure [
17,
18] so they espoused LAT and associated the modelling and investigational outcomes. Current efforts on layer examination draw on [
18,
19,
20,
21]. Studies of Sajid et al. [
19] has motivated to study the TGF with non-Newtonian factors. Moreover, Ali et al. [
21] figured the transport properties for a diverse coating flow-design, and by comparable composite liquids. Here, the resolution and objective of contemporary investigation is to originate the thin film making device for TGF and to examine in what way the liquid characteristics influence the blade coating process. In this work, optimal homotopy asymptotic method (OHAM) [
20,
21,
22,
23,
24,
25,
26,
27,
28] based solution is presented. The manuscript is categorized in four sections. In
Section 2,the governing equation based upon the heat transfer equation is formulated. In
Section 3, computational remarks for solution based on OHAM are given. The results are discussed in
Section 4, narrating some cases as examples. Finally, in
Section 5, the paper is summarized.
2. Materials and Methods
A two-dimensional blade coater model is taken which is isothermal and steady-state, as expressed in the
Figure 1. The geometry comprises of a plane substrate at the level of
, which travels with fixed speed
in
direction and a stiff blade with the blade suface asdescribed by
. The stiff blade with length
and the edges with heights
and
at
and
respectively, are held fixed at an angle
such that
. A gap originatedthrough a narrow channel within the blade and non-stationary lower-surface to apply coating material on it, would be filled by dragging an incompressible TGF due to non-Newtonian propoerty of fluid and that formulates a thin coating on non stationary substrate.
LAT is manilydesignated for this flow based field. An NNF and incompressible TGF with elastic properties crawed in voids originated within narrow route with in unmovable blade and the movable substrate, and hence carved a homogeneous coating of width
A on non-stationary surface. Principal models which administrate fluidity of NNF. Principle models which administrate stream of NNF involve the velocity profile
where
is the velocity vector. This study begins with the LAT based approach. Least gap at the nip from the web and the surface is insignificant as matched to web measurement. it would be expedient to presume a parallel flow. All-purpose liquid drive is principally in
track, although the liquid speed in s-direction is minor. Here, it is rational to adopt
and
. The fact that the divergence of
i.e.,
implies
which implies
, fulfilling continuity equation, acceleration portion of the momentum
and new form is
where
denotes the density,
is the pressure, and
represents the extra tensor for the third grade fluid which is
where
is viscosity and
is the plasiticity,
is cross viscosity and
are material constants. Also
, and
are Rivilin Erickson tensors. Here
The Equation (1) clues to momentum equation in constituent formula as
where
and
Now the generalized pressure
is given
Using Equations (4)–(6), Equations (2) and (3) take the form
Equation (8) depicts that
depends on
alone. Thus, Equation (7)is written
where
. In light of Physics, the boundary conditions are
For the governing equations which are dimensionless for the analysis of blade coating, consider the following dimensionless variables
The dimensional form of the volumetric flow rate
is
where
is thickness of web. Dimensionless represntation is
From above variables by neglecting the asterisks signs using Equation (11), the equation of motion (9) with the boundary condition (10) is
where
.
3. OHAM Formulation
In the light of OHAM [
22,
23,
24,
25,
26,
27,
28,
29,
30], the differential equation has the form
where
refers to domain. Now in Equation (14), the operator
is chosen as
The construction in light of OHAM of an optimal homotopy is following
satisfying
where parameter
is called an embedding parameter, and
is called an auxiliary function in optimal homotopy Equation (15), with properties that
for
,
. Here the constants
are to be determined. Taylor’s series about parameter
for expanding
to show estimated results are
It ca be observed that the series convergence in Equation (16) depends mainly upon the constants
. If at
, the series is convergent, then
Substitution of Equation (17) into (14) gives following residual expression
will give the exact solution. It does nothappen in general mostly in case of nonlinear problems. Using the method as mentioned in [
20,
21,
22,
23,
24,
25,
26,
27,
28]. One can determine the values of constants
.
4. Solution and Main Results
In this section, we will apply the OHAM to nonlinear ordinary differential Equation (13). According to the OHAM, we can construct homotopy of Equation (13) as
Substituting
from Equation (19) into Equation (18), and some simplifications and rearranging based on powers of
terms, we have
Solving the Equations (20)–(23)with boundary conditions, we have
With
, Equation (19) becomes
Substituting values from Equations (24)–(26) in Equation (27), we get the first-order approximate solution of (13) as follows
For finding value of the constant
shown in Equation (28), using the method of least squares as described in [
17,
18,
19] implies that setting
gives the values of constant
, where
and here
for the Equation (13) of motion is
after substituting the values, we get
Thus with the choice of
and
, the Equation (30) gives
Finally using Equation (29), we get the following values of
Choosing the real value of
, i.e.,
; similarly for different values of
, the values of constant
are shown in the
Table 1.
Corresponding these values, the values of
are calculated as shown in the Equations (32)–(35).
Figure 2 shows the values of
at different values of
. Also,
Figure 3 gives the nature of
at different values of
and
.
Now using from Equation (12)
gives
For fixed value of
and for different values of
, the values of constant
are shown in the
Table 2.
Corresponding to these values, the values of
are calculated as shown in the Equations (36)–(39).
Figure 4 shows the values of
at different values of
. Also,
Figure 5 gives the nature of
at different values of
and
.
For fixed value of
and for different values of
, the values of constant
are shown in the
Table 2. the values of
are calculated as shown in the Equations (40)–(43).
Figure 6 shows the values of
at different values of
. Also,
Figure 7 gives the nature of
at different values of
and
.
The Equation (6) for the stress, after some manipulation becomes in dimensionless form as
which is as
For fixed values of
in
give the value of constant
, then for different values of
, the values of stress
are calculated as shown in the Equations (45)–(48).
Figure 8 shows the values of stress
at different values of
. Also the
Figure 9 gives the nature of
at different values of
and
. Stratagems the normal stress properties at altered locations of TGF coating progression in dissimilar standards it is perceived that strain upsurges with growing
for constant
. These results are in accordance with [
29,
30,
31,
32,
33,
34,
35,
36,
37,
38].
Figure 9 shows normal stress at different values of
. Stratagems the normal stress properties at altered locations of TGF coating process in various perspective. It is perceived that strain is increasing through the area of coating with growing
.
Figure 2,
Figure 3,
Figure 4,
Figure 5,
Figure 6,
Figure 7,
Figure 8 and
Figure 9 provide a TGF implementation of the blade thin film and in what way the dissimilar restrictions and physical constraints. Some results are represented in the form of graphs, though results are given in a tabularized arrangement.
Figure 2,
Figure 3,
Figure 4,
Figure 5,
Figure 6 and
Figure 7 are the graphical representation of velocity for dissimilar non-Newtonian fluids’ parameters. These graphical representations designate that the velocity contours is the combination of Poiseuille and Couette kind of flow streams. In graphical representations of
Figure 2,
Figure 5 and
Figure 6, velocity contours reduce with enhancing NNF parameter. Upsurge in the NNF factor
resembles the shear condensing consequence that rises the liquid viscidness and declines liquid speed as supported by [
37,
38,
39,
40,
41,
42,
43].
Figure 8 shows behavior of normal stresses at dissimilar values of
.
Figure 9 shows behavior of shear stresses at varying values of
and
Figure 2,
Figure 3,
Figure 4 and
Figure 5 obviously display β upsurges the NNF character upsurges, i.e., the shear thickening escalates that decreases the liquid flow rate.