Numerical study of heat and mass transfer characteristics on a falling film horizontal tubular absorber for R-134a-DMAC

The present study investigates the flow, heat and mass transfer behavior of a falling film horizontal absorber by employing a two-dimensional numerical technique. The refrigerant, R-134a (1,1,1,2-tetrafluroethane) is absorbed by the falling film of the R-134a-DMAC (dimethyl-acetamide) solution. The...

Full description

Saved in:
Bibliographic Details
Published in:International journal of thermal sciences 2011-02, Vol.50 (2), p.149-159
Main Authors: Harikrishnan, L., Tiwari, Shaligram, Maiya, M.P.
Format: Article
Language:English
Subjects:
Absorber characteristics
Applied sciences
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Falling
Falling film horizontal tubular absorber
Flow rate
Heat and mass transfer
Heat transfer
Horizontal
Mass transfer
Mathematical analysis
Mathematical models
Matlab
Numerical study
R-134a-DMAC
Refrigerants
Refrigerating engineering
Refrigerating engineering. Cryogenics. Food conservation
Techniques. Materials
Theoretical studies. Data and constants. Metering
Tubes
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The present study investigates the flow, heat and mass transfer behavior of a falling film horizontal absorber by employing a two-dimensional numerical technique. The refrigerant, R-134a (1,1,1,2-tetrafluroethane) is absorbed by the falling film of the R-134a-DMAC (dimethyl-acetamide) solution. The related governing equations are solved using a developed computer code in MATLAB. The velocity, temperature and concentration fields in the domain are computed for varying operating parameters. The peak value of mass flux is found to decrease with increase in the solution flow rate and for higher solution flow rates the peak occurs at further downstream location on the tube surface. The local heat transfer coefficient is higher for lower solution flow rate and vice-versa. The mass transfer coefficient increases up to certain angular position and then begins to decrease. Optimum solution flow rate for maximum total mass flux corresponds to a particular tube diameter.
ISSN:1290-0729
1778-4166
DOI:10.1016/j.ijthermalsci.2010.10.004