Experimental Investigation of Air Humidification through Convergent and Divergent Rectangular Duct. | ||||
| MEJ- Mansoura Engineering Journal | ||||
| Article 8, Volume 38, Issue 1, March 2013, Page 1-13 PDF (14.91 MB) | ||||
| Document Type: Research Studies | ||||
| DOI: 10.21608/bfemu.2020.115626 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Ahmed Abd El-Razik Ahmed Sultan1; Hesham Mostafa  2; Aly M. Alboz3; Saleh Abdelhady2
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| 1Professor of Mechanical Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt. | ||||
| 2Mechanical Engineering Department., Higher Technological Institute., Egypt. | ||||
| 3Mechanical Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt. | ||||
| Abstract | ||||
| Evaporation rate of water into air flow over water panel which fixed in the floor of a rectangular wind tunnel is investigated, experimentally. Flow passage area variation is constructed by fixing wedges in the ceiling of the test section; in front of water panel. Two configurations are achieved for passage in the section; convergent configuration and divergent configuration. Convergent configuration increases air velocity accordingly there is a negative pressure gradient, and Convergent configuration decreases air velocity accordingly there is a positive pressure gradient. The required measurements for velocity, temperature and humidity, are taken at upstream and downstream over the water panel. Also, the amount of water evaporated through each experiment was measured. The effect of flow passage area variation of the evaporation rate is investigated at different values of Reynolds number and its impacts on Sherwood number are considered. The rang tested for Reynolds number is (4000>Re>11000). The obtained experimental results show that, Nusselt and Sherwood numbers increases with increasing Reynolds number for both convergent and divergent configuration. Sherwood number takes higher values in case of convergent configuration than the divergent configuration. The maximum enhancement in Nusselt about 150% and Sherwood numbers is about 140%at Re=11446 and area ratio parameter (β=1.05) in the considered operating ranges. Empirical correlations for Nusselt and Sherwood numbers as a function of Reynolds number, Prandtl and Schmidt numbers. Evaporation rate of water into air flow over water panel which fixed in the floor of a rectangular wind tunnel is investigated, experimentally. Flow passage area variation is constructed by fixing wedges in the ceiling of the test section; in front of water panel. Two configurations are achieved for passage in the section; convergent configuration and divergent configuration. Convergent configuration increases air velocity accordingly there is a negative pressure gradient, and Convergent configuration decreases air velocity accordingly there is a positive pressure gradient. The required measurements for velocity, temperature and humidity, are taken at upstream and downstream over the water panel. Also, the amount of water evaporated through each experiment was measured. The effect of flow passage area variation of the evaporation rate is investigated at different values of Reynolds number and its impacts on Sherwood number are considered. The rang tested for Reynolds number is (4000>Re>11000). The obtained experimental results show that, Nusselt and Sherwood numbers increases with increasing Reynolds number for both convergent and divergent configuration. Sherwood number takes higher values in case of convergent configuration than the divergent configuration. The maximum enhancement in Nusselt about 150% and Sherwood numbers is about 140%at Re=11446 and area ratio parameter (β=1.05) in the considered operating ranges. Empirical correlations for Nusselt and Sherwood numbers as a function of Reynolds number, Prandtl and Schmidt numbers. | ||||
| Keywords | ||||
| Heat and mass transfer; Humidification; moist air; duct flow | ||||
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