COUPLED HEAT AND MASS TRANSFER DURING ABSORPTION OF WATER VAPOUR INTO LiBr-H2O SOLUTION FAN SHEETS

Acosta, A. J.; García, Nelson Afanador

doi:10.1615/ichmt.2008.cht.1330

Cited by 1 publication

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“…(iv) The absorbed mass and the heat of absorption released at the sheet surface are both transported by advection and diffusion into the fan sheet. An energy balance at the free surface of the fan sheet provides the next boundary condition [34]:…”

Section: Bþmentioning

confidence: 99%

“…It consists of a semi implicit numerical scheme that marches the solution along the radial direction of the sheet from the initial position r r 0 . A detailed description of this method can be found in [34]. Since the equations involved in the problem are nonlinear, their numer ical solution is computationally demanding inasmuch as it requires the inversion of a large matrix during every integration step.…”

Section: Numerical Solution Of the Nonlinear Modelmentioning

confidence: 99%

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Modelling non-isothermal absorption of vapour into expanding liquid sheets

Acosta-Iborra

García

Santana

2009

International Journal of Heat and Mass Transfer

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a b s t r a c tThe problem of non isothermal absorption of vapour into freely expanding liquid sheets is addressed in this study. This is done in the context of four models that characterise the coupled heat and mass transfer in the liquid phase: a nonlinear model retaining the effect of sheet growth, an approximate model for slowly increasing mass flow rate in the sheet, a large Lewis number model and finally, a boundary layer model. These models have been numerically or analytically solved and applied to the comparative anal ysis of two different working pairs, LiBr H 2 O and LiNO 3 NH 3 , under conditions representative of adia batic absorption in refrigeration systems. The limits of applicability of each model have been assessed and the sensitivity of the results to the sheet aperture angle, heat of absorption and initial subcooling has also been tested. For equal initial mass fraction and subcooling, the models indicate that Sherwood number and the rate of absorption in laminar expanding sheets for the LiNO 3 NH 3 solution are always superior to those for the LiBr H 2 O solution.

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Section: Bþmentioning

confidence: 99%

Section: Numerical Solution Of the Nonlinear Modelmentioning

confidence: 99%