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Increasing of efficiency of the cooling duct by modification of its geometry

Kiedrzyński Krzysztof

Archives of Thermodynamics

2020

Vol. 41, no 3

103--123

Increasing of the efficiency of convective cooling of the inner surface of a short duct by changing its geometry was studied by the use of electrochemical limiting current technique (ELDCT). The duct consisted of seven identical, cylindrical segments. The changes of the duct geometry were obtained by mutual displacement of neighbouring segments, towards the radial direction. Mean values of the mass transfer coefficient for each segment and friction losses for the whole channel were measured for Reynolds numbers spanning the range 7700–35300 at the five values of displacement parameter. The results were used for estimation of cooling efficiency. Recommended values of displacement were determined to point the favourable conditions of heat/mass transfer in the duct. The results may be used, e.g. in the design of heat exchangers and channels for cooling of turbine blades and electronic equipment.

Bidirectionally stretched flow of Jeffrey liquid with nanoparticles, Rosseland radiation and variable thermal conductivity

Archana M., Gireesha B. J., Rashidi M. M., Prasannakumara B. C., Gorla R. S. R.

Archives of Thermodynamics

2018

Vol. 39, no 4

33–-57

Heat and mass transfer stretched flow of an incompressible, electrically conducting Jeffrey fluid has been studied numerically. Nanoparticles are suspended in the base fluid and it has many applications such as cooling of engines, thermal absorption systems, lubricants fuel cell, nanodrug delivery system and so on. Temperature dependent variable thermal conductivity with Rosseland approximation is taken into account and suction effect is employed in the boundary conditions. The governing partial differential equations are first transformed into set of ordinary differential equations using selected similarity transformations, which are then solved numerically using Runge-Kutta-Felhberg fourth-fifth order method along with shooting technique. The flow, heat and mass transfer characteristics with local Nusselt number for various physical parameters are presented graphically and a detailed discussion regarding the effect of flow parameters on velocity and temperature profiles are provided. It is found that, increase of variable thermal conductivity, radiation, Brownian motion and thermophoresis parameter increases the rate of heat transfer. Local Nusselt number has been computed for various parameters and it is observed that, in the presence of variable thermal conductivity and Rosseland approximation, heat transfer characteristics are higher as compared to the constant thermal conductivity and linear thermal radiation.

Investigation of heat mass transfer processes in the boundary layer with injection

Perepechko L.

Archives of Thermodynamics

2000

Vol. 21, nr 3-4

41-54

The heat mass transfer processes were studied in a boundary layer over the porous flat plate using the two-parameter turbulence model. The flows with evaporation of ethyl alcohol, and water and also flows with injection of hydrogen (helium) into the laminar and turbulent outer air flow were calculated. Similarity of heat and mass transfer processes and the effect of diffusion component of the heat flux on calculations of the flow field were investigated. Comparison with experimental data on distribution of the average characteristics in the boundary layer is shown.