Abstract The flow structure and heat transfer characteristics of an isolated square cylinder in cross are investigated numerically for both steady unsteady periodic laminar the two-dimensional regime, Reynolds numbers 1 to 160 a Prandtl number 0.7. effect vortex shedding on isotherm patterns from is discussed. Heat correlations between Nusselt presented uniform flux constant temperature boundary conditions.

Effects of substrate temperature, wettability, and particle concentration are experimentally investigated for evaporation a sessile water droplet containing colloidal particles. Time-varying shapes temperature the liquid-gas interface measured using high-speed visualization infrared thermography, respectively. The motion particles inside evaporating is qualitatively visualized by an optical microscope profile final deposit profilometer. On nonheated hydrophilic substrate, ring-like forms...

Flow transitions are an important fluid-dynamic phenomena for many reasons, including the direct effect on aerodynamic forces acting body. In present study, two-dimensional (2-D) and three-dimensional (3-D) wake of a NACA0012 airfoil studied angles attack in range $0^\circ \leq \alpha 20^\circ$ Reynolds numbers $500 {\textit {Re}} 5000$ . The study uses water-channel experiments 2-D 3-D numerical simulations based nodal spectral-element method, level-set function-based immersed-interface...

In this paper, the low-Reynolds number ( Re = 80) flow around a row of nine square cylinders placed normal to oncoming is investigated using lattice-Boltzmann method. The effects cylinder spacing on are studied for diameter ratios 0.3 12. No significant interaction between wakes observed with spacings greater than six times diameter. At smaller spacings, regimes as revealed by vorticity field and drag coefficient signal are: synchronized, quasi-periodic chaotic. These shown result from...

The effect of buoyancy on the flow structure and heat transfer characteristics an isolated square cylinder in upward cross is investigated numerically for Re = 100 a Prandtl number 0.7. influence recirculation length, drag lift coefficients, Strouhal number, time-averaged Nusselt cylinder, each its surfaces, investigated. degeneration Kármán vortex street, previously observed experimentally circular also found more bluff at critical Richardson 0.15. Heat heated/cooled are studied as function number.

This work presents a novel two-fluid method based on our recently proposed viscosity model for red blood cells (RBCs)—for simulating three-dimensional (3D) flow in microchannel of dimension comparable to the diameter and larger. Toward this, whole is assumed as suspension plasma, with each phase considered interpenetrating continua having its separate mass momentum conservation equations. The approach-based performance study presented after comprehensively validating it experimental data...

ABSTRACT The flow structure and heat transfer characteristics of a square cylinder in cross are investigated numerically for both unconfined channel-confined (blockage ratios, 10–50% steps 10%) situations at Reynolds numbers 50, 100, 150, Prandtl number 0.7. As the blockage ratio is increased, onset vortex shedding increases then decreases. Increases Strouhal number, drag coefficient, pumping power, Nusselt also observed with increasing ratio. enhancement due to channel confinement uniform...

ABSTRACT The effects of Reynolds and Prandtl numbers on the heat transfer characteristics an isolated square cylinder have been investigated for range conditions 1 ≤ Re 45 0.7 Pr 4,000 (the maximum value Peclet number being 4,000) in crossflow. Heat correlations are obtained constant temperature flux boundary a solid steady flow regime. In addition, variation local Nusselt each face obstacle representative isotherm plots presented to elucidate role

Abstract The flow around six in-line square cylinders has been studied numerically and experimentally for $0. 5\leq s/ d\leq 10. 0$ $80\leq \mathit{Re}\leq 320$ , where $s$ is the surface-to-surface distance between two cylinders, $d$ size of cylinder $\mathit{Re}$ Reynolds number. effect spacing on regimes initially at $\mathit{Re}= 100$ which a synchronous regime observed 1. 1$ while quasi-periodic-I quasi-periodic-II chaotic occur $1. 2\leq 3$ 4\leq 5. $6. 0\leq respectively. These have...

A generic kinematic model is presented for a unified hydrodynamics study covering the various types of motion found in real as well hypothetical fish-like undulation. Undulating here motion, considering chordwise forced flexibility—modelled by wavelength undulation λ*—of rigid NACA0012 hydrofoil free-stream flow. Using level-set immersed boundary method-based in-house code, non-dimensional wavelengths, λ* (0.8–8.0), and frequency undulation, St (0.2–0.7), at constant maximum amplitude 0.1...

A focus on the present numerical study is fan air flow-used in oil natural air-forced cooling system of a 25-MVA power transformer. An experiment done to benchmark simulation methodology for fan. Thermal performance radiator assembly studied two parts: 1) effect horizontal and vertical blowing direction different fans at speeds 2) offset one direction. Vertical as compared less efficient dissipating heat from considered here, more gets wasted sides. This contrast commonly encountered results...

Bouncing and non-bouncing impact dynamics of a droplet on solid surface are studied experimentally numerically. High-speed visualization an in-house dual-grid level-set method based solver employed. Two established contact angle models, namely, Kistler Fukai implemented in the solver. While model employs time-varying dynamic angle, accounts for quasi-dynamic line velocity. Better agreement between present numerical result as well published experimental results is found model, specifically...

A fluid multi-structure interaction (FMSI) study on flow-induced coupled vibrations of an elastically mounted cylinder and a detached flexible plate is carried out numerically at constant $Re=100$ . The effect non-dimensional gap $G^{*}$ between the two structures, reduced velocity $U_{c}^{*}$ , proximity-induced flow physics vibration characteristics system presented. FMSI shows two-state response: state 1 larger gaps $G^{*}\geqslant 1$ 2 smaller $G^{*}\leqslant 0.5$ At encounters...

ABSTRACT The present article is on pulsatile hemodynamics‐induced sound‐based diagnosis of stenosis in compliant arteries three types: Coronary, carotid, and femoral. Considering axisymmetric straight along with clinically observed dimensions the enveloping tissue, numerical study considers blood as a Newtonian fluid both artery tissue isotropic geometrically nonlinear (materialistically linear) solid. For physiological flexible‐structure acoustic interaction (FfSAI) study, an in‐house...