Evaporation Condensation and Heat transfer Part 4 pot

[...]... 40 50 60 70 80 90 100 τ, min Fig 16 Run of events (a) and boiling curves for water-oil iterm 12 mixture (b); εol=12% vol  144 α2F, W/(m2.K) Evaporation, Condensation and Heat Transfer q=36,3 kW/m2 5000 εo 17% 15% 14% 11% 9% 7% 6% 4% 2% 45 00 40 00 3500 3000 τlim 2500 2000 1500 1000 500 0 0 10 20 30 40 50 60 70 80 90 100 τ, min Fig 17 Run-time of heat transfer coefficient; water-iterm oil 12 mixtures (q=36,3... parameters and in consequence heat transfer coefficient redistribution, particularly for separated and heterogeneous ranges of mixture structures Past a certain limiting time (τlim), in the consequence of forming quasi-homogenous structures, heat transfer conditions staying more stabilized and that situation remains unchanged still the long time  140 50 ΔT [K] a) Evaporation, Condensation and Heat Transfer. .. Thermophysics and Aeromechanics Int J Heat Mass Transfer Actual Problems of Thermal Physics and Physical Hydrodynamics Russ J Eng Thermophys Thermophysics and Aeromechanics Thermophysics and Aeromechanics, Thermophysics and Aeromechanics Thermal Eng Thermophysics and Aeromechanics Nuclear Engineering and Design Heat Transfer at Boiling of Cryogenic Liquids Journal Nucl Sci Technol Intern J Heat Mass Transfer. .. large disturbance in heat transfer  142 Evaporation, Condensation and Heat Transfer a) ΔT [K] 100 OCW-P 90 80 OCW-RK 70 OCW-EK Water - Antracen oil 60 50 5%p1 40 30 30%p1 OCW-R 20 10 0 0 10 20 30 40 50 τ [min] 60 b) OCW-R OCW-RK OCW-EK OCW-P Fig 14 View run-time of water – anthracene oil boiling mixtures: a) temperature difference; b) image structures (εol=5/15%, q=37 kW/m2) 143 Pool Boiling of Liquid-Liquid... constant heat flux The measuring system is provided with a condenser, where the vapor condensed and recycled them into the vessel, thus ensuring the stability of the mixture composition At the test time, regardless of the observation and recording of structures, it was measured the bottom and bulk temperature, which allowed to determine the conditions of heat transfer 126 Evaporation, Condensation and Heat. .. Systems Gabriel Filipczak, Leon Troniewski and Stanisław Witczak Opole University of Technology, Chemical and Process Engineering Department, Poland 1 Introduction Heat transfer to boiling liquid is an important problem in the unit operations of evaporation and distillation and also in other kinds of general processing, such as steam generation, petroleum processing and control of temperatures In spite of... ρ26,5 = 863,7 ρ100 = 8 34, 8 ρ26,5 = 878,6 ρ100 = 853,5 ρ26,5 = 895,9 ρ99 = 1088,5 ρ20,0 = 1129,9 Surface tension, σ⋅1 04 N/m Boiling temperature, tb °C σ99 = 153,2 347 σ99 = 2 14, 1 340 σ99 = 241 ,1 353 σ99 = 266,0 350 η100= 3,9 η25,0= 69,0 η100= 10,3 η25.0= 360,3 η100= 24, 5 η26,5= 1157 ,4 η97,0= 2,6 η26,5= 58,5 Table 2 Primary properties of oils used in the experiments 3 Bulk structures and boiling patterns... both at increase and fixed in time the heat flux density It was found that type of formed structure first of all depends on the heat flux density and duration of the process and the volume oil fraction and a small extent of its kind Heterogeneous structure occurred first of all in the initial period of boiling to smaller values of heat flux, a quasi-homogeneous structure of the average and larger values... registered at the time of boiling process are shown 138 Evaporation, Condensation and Heat Transfer 10000 α , W/(m 2 K) WATER ITERM 6Mb ITERM 12 ITERM 30MF Water-oil mixture 1000 100 1000 10000 100000 q, W/m2 α , W/(m 2 K) 10000 Water-oil mixture 1000 WATER ITERM 6Mb ITERM 12 ITERM 30MF 100 1 10 100 ΔT, K Fig 9 Heat transfer coefficient for water and water-iterm oil mixtures 100000 q, W/m2 WATER OIL... Mori et al., 1978, 1980) include the cases of durable water-oil emulsion boiling and that only in regard to the situation when the oil is the phase of lower 1 24 Evaporation, Condensation and Heat Transfer density than water, also in the situation when a more volatile component of mixture is in direct contact with the heating surface (Gorenflo, 2001) The opposite situation can be met, among others, . bottom and bulk temperature, which allowed to determine the conditions of heat transfer. Evaporation, Condensation and Heat Transfer 126 a) b) c) d) Fig. 1. Heat transfer. durable water-oil emulsion boiling and that only in regard to the situation when the oil is the phase of lower Evaporation, Condensation and Heat Transfer 1 24 density than water, also in the. Evaporation, Condensation and Heat Transfer 128 The much more complex structures occur during boiling watered coal tars or mixtures of water and oil (with presence of oil lighter and