Numerical study of the effect of blockage ratio on the flow past one and two cylinders in tandem for different power-law fluids

Numerical study of the effect of blockage ratio in forced convection confined flows of shear-thinning fluids

“…The VMS method used in this work has demonstrated robustness and accuracy in different numerical scenarios (Castillo & Codina 2019;González et al 2020;Ruz et al 2021). In our case, it is used to solve a new problem that involves the forced convection of power-law fluids.…”

“…To define the total length of the pipe, we require the upstream distance (L u = 12D) and downstream distance (L d = 15D). The values used in this work ensure that the boundary conditions do not perturb the fluid dynamics (Dhiman et al 2008;Ruz et al 2021). Because different blockage ratios are used, the height of the pipe (and width in the three-dimensional case) are defined as H = D/β.…”

“…Concerning the intrinsic nonlinear behaviour of this kind of fluid, advantageous properties in heat transfer and in the development of chaotic flows for relatively low Reynolds numbers have been studied (Bharti, Chhabra & Eswaran 2007a,b;Sahu, Chhabra & Eswaran 2009). In Ruz et al (2021), the Hopf bifurcation of non-Newtonian isothermal fluids past one and two cylinders in tandem under different blockage ratios is determined. In that work, the authors found that the critical Reynolds number decreases as the power-law index decreases.…”

“…Hence, the novelty of this work is to perform an exhaustive numerical analysis that considers the shear-thinning characteristics of different power-law fluids and the effect of the blockage ratio on the heat transfer and fluid dynamics. Numerical simulations are performed using an in-house code based on the finite element method, which has proven to be robust and accurate in Newtonian and non-Newtonian problems (Castillo & Codina 2019;Abugattas et al 2020;González, Castillo & Cruchaga 2020;Ruz et al 2021).…”

Parameter optimization of anti crystallization flocking drainage pipe based on flow field distribution characteristics

“…Laboratory tests have proved that flocking drainage pipe has the effect of preventing and controlling crystal blockage [8][9][10][11], and the flow rate is directly related to the amount of crystal in drainage pipe [12]. For the 3-D case, different fluids are compared for a fixed Reynolds number and blockage ratio, proving that pseudoplastic fluids increase mixing capacity [13]. The total drag and lift coefficients decrease from the parallel mode to oblique mode, owing to the intensified 3-D of wake flows and the phase difference in the spanwise vortex shedding [14].…”