Results 241 to 250 of about 34,357 (300)

Performances of falling film evaporators

Journal of Dairy Research, 1991
SummaryThe performances of falling film evaporators used in the New Zealand dairy industry for concentrating skim milk, whole milk and buttermilk were evaluated by determining (1) the kg steam used per kg water evaporated, and (2) the heat transfer coefficient of each pass in the evaporators. A computer program was used to calculate the results.
R. Selwyn Jebson, Mani Iyer
openaire   +1 more source

A Falling-Film Evaporator with Film Promoters

Industrial & Engineering Chemistry Research, 2004
Falling-film evaporators have been used extensively in chemical processing plants due to their minimal fluid residence time and high heat transfer rates with low temperature differences. A cheaper alternative for achieving suitable liquid distribution and film stability was investigated here for solutions with low solids content and sufficiently low ...
Wilson M. Salvagnini, Maria E. S. Taqueda   +1 more
openaire   +1 more source

Performance Prediction of Falling-Film Evaporators

Journal of Heat Transfer, 1972
Three experimental results in the literature involving the evaporation of water and of brine in falling-film evaporators have been compared to predictions in which were used the local heat-transfer coefficients experimentally correlated as h = A(Λ/μ)n, where the constants A and n take on different values depending on the flow regime of the falling film,
K. R. Chun, R. A. Seban
openaire   +1 more source

Falling film evaporation of binary mixtures

AIChE Journal, 1994
AbstractThe interactive effects of heat and mass transfer in evaporation of binary mixtures flowing as falling films on vertical surfaces was investigated. Evaporative heat‐transfer coefficients were measured for aqueous mixtures of ethylene and propylene glycol, with boiling ranges up to 55°C.
J. W. Palen, Qi Wang, J. C. Chen
openaire   +1 more source

The falling film MSF evaporator

Desalination, 1976
Abstract The application of falling film heat transfer to the MSF cycle permits use of CO2 for scale prevention at no cost and the building of efficient very small capacity units with heating surfaces that are fully accessible during operation. It also becomes possible to use doubly fluted tubes for a 2 3 saving in heating surface requirements.
openaire   +1 more source

Surface evaporation of turbulent falling films

International Journal of Heat and Mass Transfer, 1991
Abstract In refrigeration and heat pump applications, falling film evaporators should be very attractive due to high heat transfer coefficients with negligible pressure drop. In this paper results from an experimental study with refrigerant R12 are reported.
Anders Åsblad, Thore Berntsson
openaire   +1 more source

Modelling of multiple-effect falling-film evaporators

International Journal of Food Science and Technology, 1983
Abstract The classic mathematical model of multi-effect evaporators operating in forward flow was combined with an accurate estimation of the overall heat transfer coefficient (HTC) in falling-film evaporators. For this correlation developed by Narayanamurthy & Sarma (1977) has been used. It was possible also to estimate the order of
SANDRO ANGELETTI, MAURO MORESI
openaire   +1 more source

Calcium sulphate scaling in falling film evaporators

Desalination, 1974
Abstract The formation of calcium sulphate scale in Vertical Tube Evaporators (VTE) of the falling film type has been investigated in a single tube experiment using fluted tubes. It was found that the scaling threshold is dependent not only on the brine concentration and temperature, but also on the heat flux to the evaporating film.
T.D. Hodgson, M.N. Elliot, T.W.J. Jordan
openaire   +1 more source

Conjugate heat transfer during falling film evaporation

International Communications in Heat and Mass Transfer, 1995
Abstract An analytical solution is derived for a transient conjugate heat transfer problem in three domains: a solid wall, an evaporating falling liquid film, and a flowing gas. The physical model comprises a vertical wall, heated on one side by radiation and convection and cooled on its other side by two fluids: a falling water film at the top and ...
I. Arshavski, Y. Nekhamkin, S. Olek, E. Elias   +3 more
openaire   +1 more source

Non-evaporating black liquor falling film hydrodynamics

Nordic Pulp & Paper Research Journal, 2009
Knowledge of wave behaviour is a key factor for understanding heat transfer in falling film evaporators. Here the industrially important fluid black liquor has been examined, together with water which has been used as a reference. Notable results are that there are large local fluctuations in the film thickness; for instance at a Re number of 4100 in ...
Miriam Johansson, Lennart Vamling, Lars Olausson   +2 more
openaire   +1 more source