Surface tension of lithium bromide solutions with heat-transfer additives

Abstract

The surface tensions of concentrated aqueous solutions of lithium bromide and of lithium chloride are measured by using a drop-volume method. The effect of 1-octanol and 2-ethylhexanol on surface tension Is determined for a 50% by weight lithium bromide solution.

LiBr · 2H2O Crystallization Inhibition in the Presence of Additives

“…• C) of LiBr · 2H 2 O with 500 ppm uramil-N ,N -diacetic acid additive; and (e) 90 erg/cm 2 , the value of the solution/air interface at these LiBr concentrations (17). This is in good agreement with our experimental observations, as seen by comparing Fig.…”

Surface tension and refractive index of (lithiumbromide + water + 1,3-propanediol)

“…(6) Wen Yao et al examined the effect of heat-transfer additives on the surface tension by using a dropvolume apparatus. (7) In a previous paper, (8) we proposed a new working fluid containing 1,3-propanediol in order to overcome crystallization in air-cooled absorption machines when pure lithium bromide was used.…”

Methods for Determining the Marangoni Numbers in Studying the Absorption in the Operation of a Heat Pump

“…Data on the interfacial tension in the aqueous lithium bromide solution-water vapor system in equilibrium at constant vapor pressure are unavailable. To answer the question of how available data on surface tension should be used, let us initially consider an aqueous lithium bromide solution without surfactant.Data on the surface tension of aqueous lithium bromide solutions without surfactant [5][6][7] and with various surfactants [2, 7-9] are available in the literature. These data are usually presented as tables or plots describing the dependence of the surface tension on two independent variables: the lithium bromide concentration in solution (or water) and temperature.…”

“…Data on the surface tension of aqueous lithium bromide solutions without surfactant [5][6][7] and with various surfactants [2,[7][8][9] are available in the literature. These data are usually presented as tables or plots describing the dependence of the surface tension on two independent variables: the lithium bromide concentration in solution (or water) and temperature.…”

“…These data were obtained for the system in equilibrium; therefore, from each pair of values of the temperature T and the concentration C , one can calculate the vapor partial pressure P from expressions P = P ( C , T ) describing the equilibrium state. Table 1 gives the vapor partial pressure values calculated from the published equilibrium expressions [10] and also presents the surface tension data σ [7].…”