14 research outputs found
Modelling of the Temperature Difference Sensors to Control the Temperature Distribution in Processor Heat Sink
Convective heat transfer for fluids passing through aluminum foams
This paper analyses the experimental findings within heat transfer when heating up air, water and oil streams which are passed through a duct with internal structural packing elements in the form of metal foams. Three types of aluminum foams with different cell sizes, porosity specifications and thermal conductivities were used in the study. The test data were collected and they made it possible to establish the effect of the foam geometry, properties of fluids and flow hydrodynamic conditions on the convective heat transfer process from the heating surface to the fluid flowing by (wetting) that surface. The foam was found to be involved in heat transfer to a limited extent only. Heat is predominantly transferred directly from the duct wall to a fluid, and intensity of convective heat transfer is controlled by the wall effects. The influence of foam structural parameters, like cell size and/or porosity, becomes more clearly apparent under laminar flow conditions
Phenomenological assessment of water-oil patterns formed during pool boiling
W pracy przedstawiono wyniki bada艅 i analiz dotycz膮cych warunk贸w wnikania ciep艂a podczas wrzenia mieszaniny cieczy wzajemnie nierozpuszczalnych. Eksperymenty przeprowadzono w du偶ej obj臋to艣ci i pod ci艣nieniem atmosferycznym, wykorzystuj膮c jako czynniki robocze wod臋 oraz oleje o r贸偶nych w艂a艣ciwo艣ciach. Scharakteryzowano warunki wnikania ciep艂a przy r贸偶nej zawarto艣ci obu sk艂adnik贸w mieszaniny.Experimental results of heat transfer during pool boiling of two immiscible liquids are presented. The experiments were carried out under atmospheric pressure. Water and various oil mixtures were used as working liquids. The conditions of heat transfer for a different content of both liquids in the mixture were characterized
Benefits of using dispersing agitators in suspension production process
W pracy dokonano eksperymentalnej oceny celowo艣ci wykorzystania mie-szade艂 dysperguj膮cych w procesie wytwarzania zawiesin cia艂a sta艂ego w cie-czy niutonowskiej i nieniutonowskiej. Podano r贸wnania opisuj膮ce warunki pracy mieszad艂a, konieczne do wytworzenia zawiesiny ca艂kowitej. Dla tych warunk贸w por贸wnano moc mieszania mieszad艂a dysperguj膮cego z moc膮 standardowej turbiny Rushtona.In the paper experimental estimation of advisability of using dispersing agitators in production process of solid suspensions in Newtonian and non-Newtonian fluids was conducted. Correlations describing working conditions of agitators necessary to achieve complete suspension were determined. The mixing power of dispersing agitators with the power of standard Rushton turbine was compared for these conditions
Research of hydrodynamics of water-oil systems
W artykule, przedstawiono wyniki bada艅 przep艂ywu dwufazowego woda olej w rurach pionowych. Om贸wiono wp艂yw parametr贸w przep艂ywu i w艂a艣ciwo艣ci faz na rodzaj kszta艂tuj膮cych si臋 struktur, rzeczywiste udzia艂y obj臋to艣ciowe faz oraz straty ci艣nienia.The paper presents test results of water-oil two-phase flow in vertical pipes. An influence of flow parameters and properties of phases on a type of formed flow structures, void fractions and pressure drop is discussed