2023· Social Science Research Network· 0 citations· 32 references
Abstract
This paper shows that the conventional Reynolds number has a clear physical meaning only for laminar, hydraulically developing or unsteady flow, while the generalized Reynolds number is physically meaningful for both laminar and turbulent regimes; the two Reynolds numbers coincide only in case of laminar flow. A review of widely used heat transfer correlations for turbulent liquid flow in smooth pipes (Re > 2000) is presented, and new correlations are developed using the generalized Reynolds number. The analysis is based on a database of 1025 experiments (including 110 in the transitional regime), covering Re = 2000-522000 and Pr = 0.18-414. The proposed correlations apply over the same ranges and show improved statistical performance, exceeding commonly cited correlations by 4.7-7.8 percentage points. It is also demonstrated that the range Re = 2000-4000 represents a hybrid region where both Reynolds and Graetz numbers simultaneously affect the Nusselt number.
Wall-resolved Large Eddy Simulations are performed to investigate turbulent heat transfer in a rough pipe over a range of Pr. The roughness is generated using a controlled numerical procedure that allows independent specification of roughness correlation length, amplitude, and skewness; a statistically Gaussian heigh...
Himani Garg· Journal of turbomachinery· 0 citations
A three-dimensional laminar flow for 37 Reynolds numbers, primarily in low Reynolds number regime with water flow through six rectangular microchannels have been modeled conducting 222 simulations to develop correlations for fully developed friction factor and incremental pressure drop number to determine apparent fR...
D. Ray, D. Das, John H. Halford· Journal of Fluids Engineerin...· 0 citations
For compressible wall-bounded turbulence, the logarithmic law for velocity profiles has been extensively investigated through various successful velocity transformations, yet a robust counterpart for the mean temperature remains absent. To bridge this gap, the present study introduces a novel temperature transformation...
A numerical investigation of steady forced convection heat transfer from an isoflux circular cylinder immersed in the liquid metal Galinstan is presented. The governing streamfunction, vorticity, and energy equations are solved using a fourth-order compact finite difference scheme in cylindrical coordinates (FOCS--CC)...
This paper presents a detailed numerical investigation of the turbulent flow structure around a NACA0012 airfoil at low Reynolds numbers using a two-fluid turbulence model implemented in the COMSOL Multiphysics environment. The study focuses on Reynolds numbers ranging from 10,000 to 30,000 at an angle of attack of...
Z. Abdulkhaev, Nilufar Kurbonova, D. Kadirova et al.· Mathematical Models in Engin...· 0 citations
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