Publication Date:
2012-07-19
Description:
The modeling equations for the temperature distribution and temperature polarization profiles in a laminar concurrent-flow parallel-plate direct-contact membrane distillation (DCMD) module were developed theoretically. The analytical solutions for such conjugated Graetz problems in DCMD systems were obtained using the variable separation method with an orthogonal expansion technique extended in power series. A description of the average Nusselt number variations and temperature distributions of both the hot and cold feed streams is given. The feed velocity effect on the temperature profiles and average Nusselt number was examined and is reported by employing the computed eigenvalues and the relevant constants. The analytical results show that the initial saline temperature effect on the hot feed stream regarding the pure water productivity is more significant than that of the hot and cold feed stream velocity variations. Modeling equations were developed theoretically for the temperature distribution and temperature polarization profiles in a laminar concurrent-flow parallel-plate direct-contact membrane distillation (DCMD) module. The feed velocity effect on the temperature profiles and average Nusselt number was examined. Good agreement between the experimental results and the theoretical predictions was achieved.
Print ISSN:
0930-7516
Electronic ISSN:
1521-4125
Topics:
Chemistry and Pharmacology
,
Process Engineering, Biotechnology, Nutrition Technology
