National Repository of Grey Literature 371 records found  beginprevious362 - 371  jump to record: Search took 0.02 seconds. 
Numerické řešení sdílení tepla v proudu dopadajícím na stěnu
Kozel, K. ; Louda, Petr ; Příhoda, Jaromír
The paper deals with the numerical solution of 3D impinging turbulent jet cooling a weakly heated wall. The solution was carried out using the SST model and/or an explicit algebraic Reynolds stress model and completed by a generalized gradient-diffusion hypothesis for modelling of turbulent heat flux. While the EARSM model gives good results for the velocity field, all used models overestimate heat transfer in the impingement region.
Prediction of radiative heat transfer in argon arc plasmas using the method of partial characteristics
Aubrecht, Vladimír
Radiative heat transfer is a significant energy exchange process in arc plasmas. In the paper, an approximate Method of partial characteristics (MPC) is used to evaluate radiation intensities in argon arc plasmas of cylindrical symmetries at the atmospheric plasma pressure.
Heat transfer efficiency of impinging jets
Pražák, Josef ; Mocikat, H. ; Herwig, H.
The experiments with the impinging air jets are referred to. The attention is paid to the comparison of the heat transfer efficiency. The comparison with free convection is discussed and explicit formulas are introduced.
Comparison of heat transfer efficiency of various impinging jets
Pražák, Josef ; Herwig, H. ; Mocikat, H. ; Goeppert, S.
The experiments with the impinging air jets are referred to. An attention is paid to the methodology of the treating of the experimental results for the case, where different nozzles and geometries of the experiment should be compared. A comparison with the case of the free convection was chosen as a tool for the discussion of experimental results.
Experimentální a numerické řešení dvourozměrného impaktního proudu s řízeným přisáváním
Trávníček, Zdeněk ; Vogel, J.
Original scientific work on the theme of experimental and numerical solution of two-dimensional impinging jet with controlled entrainment.
Effect of the heat transfer on the laminar flow in the entrance region of a circular tube
Mík, Václav
An analytical-numerical model of the velocity and temperature field was created, whose parameters are expressed as functions of the thickness of the hydrodynamic and thermal boundary layers. This model converts the set of specific partial differential equations to a set of ordinary differential equations that are always valid in one of three regions into which the entrance region is divided by above mentioned boundary layers.
Decrease of heat transfer and pressure drop in the flow of drag reducing surfactant in helical tube
Mík, Václav ; Myška, Jiří ; Kořenář, Josef
The flow in a helical tube was studied experimentally and change of heat transfer and pressure drop caused by addition of 3 different amount of a surfactant was shown. The measurements were done at a constant heat flux at the wall q = 50 and 75 kW/m2; the Reynolds numbers were between 10600 and 71000 and temperatures from 15 to 55°C. The decrease of heat transfer along the coiled tube caused by presence of the surfactant and effect of drag reduction in heat transfer were confirmed.
Experimental verification of heat pipe properties
Vlach, Radek ; Ondrůšek, Č.
A paper describe experntal measuring on the heat pipe. A main was verification of properties of heat pipe. Result was value of heat flow, whis is transfered by heat pipe.

National Repository of Grey Literature : 371 records found   beginprevious362 - 371  jump to record:
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