Parametric analysis of direct contact sensible heat transfer in spray columns
TL;DR: In this article, a theoretical analysis of direct contact sensible heat transfer between two immiscible liquids in a countercurrent spray column is presented, and the non-dimensional parameters governing the heat transfer process are identified and a study of the effects of the variation of these parameters is made.
About: This article is published in Letters in Heat and Mass Transfer.The article was published on 1982-07-01. It has received 8 citations till now. The article focuses on the topics: Sensible heat & Countercurrent exchange.
Citations
More filters
TL;DR: In this paper, the average volumetric heat transfer coefficient in a spray column liquid-liquid-vapour direct contact evaporator has been experimentally investigated using a cylindrical Perspex tube of diameter 10 cm and height and 150 cm.
33 citations
TL;DR: In this paper, a simple mathematical model is proposed to describe the dynamic thermal behavior of a counterflow cooling tower, taking into account both the sensible and latent heat cooling effects on the tower performance.
21 citations
TL;DR: In this article, the authors investigated the local volumetric heat transfer coefficient and active height of a spray column three-phase direct contact heat exchanger (evaporator) with a cylindrical Perspex tube of 100 cm height and 10 cm diameter.
20 citations
TL;DR: In this article, the distribution of fluid temperatures in a direct contact heat exchanger is analyzed analytically by integration of the one-dimensional energy equations, and the influences of decisive parameters on the temperature distributions along the column are examined.
11 citations
TL;DR: In this article, the temperature distribution of a liquid-liquid-vapour three-phase direct contact heat exchanger, both experimentally and theoretically, was investigated using a Perspex column with an internal diameter of 10.5 cm and 100 cm height.
10 citations
References
More filters
TL;DR: In this paper, heat transfer to drops moving in a constant-temperature field and continuously varying temperature field is discussed, and three models are taken into account: rigid drop, completely mixed drop, and drop with internal circulation.
Abstract: Publisher Summary The basic characteristics of heat transfer between dispersed and continuous media are of both scientific and practical interest. The advantages of direct-contact heat transfer over the conventional processes using metallic transfer surfaces have lately stimulated research on its utilization for water desalination projects. Despite intensive efforts toward better understanding of transfer phenomena between drops and continuous media, accurate prediction of the transfer coefficients for a given system can as yet only be hoped for. Nevertheless, accumulated experience may provide an indication of the transfer mechanism to be encountered and the relevant coefficients may be estimated accordingly. This chapter discusses heat transfer to drops moving in a constant-temperature field and continuously varying temperature field. Heat is transferred to drops and bubbles with simultaneous phase change. While discussing about constant-temperature field, three models are taken into account: rigid drop, completely mixed drop, and drop with internal circulation. Work on direct-contact heat exchangers was stimulated earlier by the quest for economic water-desalination units. Multiphase exchange, where latent heat is transferred among the immiscible fluids, has been effectively used in direct-contact freezing units in which a dispersed volatile fluid evaporates in the saline water with simultaneous freezing of part of the water.
47 citations
TL;DR: In this article, temperature profiles of dispersed kerosene and water were measured in a spray column heat exchanger, 15 cm. in diameter and 160 cm. long, and they were used to calculate the volume of the wakes and the rate of shedding of wake elements.
Abstract: Temperature profiles of dispersed kerosene and water were measured in a spray column heat exchanger, 15 cm. in diameter and 160 cm. long. Dispersed packing of drops and narrow temperature ranges were used. The flow rates used were 0 to 50 liters/min. of water and 5 to 40 liters/min. of kerosene. The physical picture that emerges from the temperature profiles is that heat is transferred from fully mixed drops to fully mixed wakes while the wakes are formed, by shedding and renewal of elements of wakes in most of the column and by complete mixing of all streams at the water inlet at the top of the column. Mathematical equations were developed from the physical model. The volume of the wakes and the rate of shedding of wake elements were estimated from the temperature profiles and were used to calculate the temperature profiles for this and for other studies. The agreement of the calculated profiles with the experimental data is very good.
27 citations
TL;DR: In this article, a relation valable a la fois en lit lâche and en lit dense was established between the conductance de transfert de chaleur and the vitesse relative d'ecoulement of phases.
16 citations
TL;DR: In this paper, a closed periodic condensation-evaporation cycle of a two-phase vapour-liquid "bubble" driven by gravity in an immiscible continuous phase with a vertical temperature profile is presented.
10 citations
TL;DR: Rasuma et al. as mentioned in this paper present the result of relatifsal'hydrodynamique and au transfert de chaleur d'une goutte en mouvement dans un liquide immobile.
4 citations