Showing papers by "Guang Yang published in 2018"
TL;DR: In this article, the turbulent flow and heat transfer characteristics of a T-junction mixing were investigated numerically using a pore structure level using an Speziale, Sarkar and Gatski turbulence model and validated with open literature data.
Abstract: This study investigates numerically the turbulent flow and heat transfer characteristics of a T-junction mixing, where a porous media flow is vertically discharged in a 3D fully developed channel flow. The fluid equations for the porous medium are solved in a pore structure level using an Speziale, Sarkar and Gatski turbulence model and validated with open literature data. Overall, two types of porous structures, consisted of square pores, are investigated over a wide range of Reynolds numbers: an in-line and a staggered pore structure arrangement. The flow patterns, including the reattachment length in the channel, the velocity field inside the porous medium as well as the fluctuation velocity at the interface, are found to be strongly affected by the velocity ratio between the transversely interacting flow streams. In addition, the heat transfer examination of the flow domain reveals that the temperature distribution in the porous structure is more uniform for the staggered array. The local heat transfer distributions inside the porous structure are also studied, and the general heat transfer rates are correlated in terms of area-averaged Nusselt number accounting for the effects of Reynolds number, velocity ratio as well as the geometrical arrangement of the porous structures.
28 citations
20 Apr 2018
TL;DR: In this article, effective pore size is defined as a function of the porosity, the tortuosity, and the intrinsic permeability of the porous medium, where the Klinkenberg effect in different porous structures is found to be fully described by the Knudsen number.
Abstract: We define effective pore size as a function of the porosity, the tortuosity, the contraction factor, and the intrinsic permeability of the porous medium. The Klinkenberg effect in different porous structures is found to be fully described by the Knudsen number characterized by this pore size.
24 citations
TL;DR: In this paper, the surface energy of urea-water-solutions (UWS) was evaluated by ring tensiometry and contact angle measurements of sessile drops placed onto pre-determined solid substrates.
13 citations
10 citations
TL;DR: In this paper, the flow structure and temperature field of the conjugate turbulent mixed convection in an open cavity were investigated numerically and the results including the local and average temperatures as well as the average temperatures were obtained.
Abstract: The flow structure and temperature field of the conjugate turbulent mixed convection in an open cavity were investigated numerically. Results including the local and average temperatures as well as...
8 citations
TL;DR: In this article, the computational fluid dynamics method is used to study the transient nitrogen displacement process of acquiring ultra-low dew point temperature during thermal environment simulation, and a three-dime model is presented.
Abstract: The computational fluid dynamics method is used to study the transient nitrogen displacement process of acquiring ultra-low dew point temperature during thermal environment simulation. A three-dime...
6 citations
TL;DR: In this article, a numerical analysis of heat and mass transfer with film evaporation by laminar mixed convection in a vertical three-dimensional rectangular channel was conducted, where the authors investigated the outcome of inlet dry nitrogen temperature, temperature of wetted wall, Reynolds number and aspect ratio on the heat transfer of thin water film along the isothermal walls.
5 citations
TL;DR: In this article, the authors investigated the applicability of biological fluids to provide a temperature rise at the imbibition front, and successfully demonstrate a monotonic trend between the level of local temperature rise and the concentration of specific analytes.
Abstract: We present the potential of a quantitative temperature-based diagnostic approach for paper-based microfluidics, extending the work of Terzis et al. (J Colloid Interface Sci 504:751–757, 2017) which demonstrated a significant heat release at the liquid front during capillary-driven flows in cellulosic materials. Here, we investigate the applicability of biological fluids to provide a temperature rise at the imbibition front, and successfully demonstrate a monotonic trend between the level of local temperature rise and the concentration of specific analytes. In addition, effects of paper thickness and width are also examined.
3 citations
18 Nov 2018
1 citations