Heat transfer model based on diffusion layer theory for dropwise condensation with high non-condensable gas
Source abstract
Abstract
A new heat-transfer model for dropwise condensation with non-condensable gas (NCG) is developed, which can be used in the design and calculations of a dehumidifier in humidification–dehumidification technology. A single-droplet heat-transfer model is established via the rounded analysis of all the contributing thermal resistances based on the diffusion-layer theory. Combined with the drop size distribution, the heat flux of dropwise condensation with NCG is determined, and the error between the predicted results and previous experimental data is found to be within ±20%. The effects of different parameters on the heat transfer of dropwise condensation with NCG are investigated, and the results indicate that there is an optimal contact angle to maximize the heat flux, which depends on the NCG content. The thickness of the coating layer has little effect on the heat flux at a given thermal conductivity of the coating layer, indicating that the dropwise condensation effect can be improved by increasing the thickness of the coating layer, neglecting the heat-transfer deterioration due to the additional thermal resistance during dropwise condensation with NCG.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Heat Transfer and Optimization · Heat Transfer and Boiling Studies · Adsorption and Cooling Systems
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Mechanical and Power Engineering, Nanjing Tech University , No. 30 Puzhu South Road, Nanjing 211816, People’s Republic of China
Funding
Postgraduate Research & Practice Innovation Program of Jiangsu Province
References (45)
Show source-provided references
1. Recent fresh water augmentation techniques in solar still and HDH desalination—A review10.1016/j.rser.2017.09.056 ↗
2. Air-heating solar collectors for humidification-dehumidification desalination systems10.1115/1.4003295 ↗
3. Thermal investigation and performance analysis of a novel evaporation system based on a humidification-dehumidification process10.1016/j.enconman.2017.05.036 ↗
4. Numerical and experimental analysis on air/water direct contact heat and mass transfer in the humidifier10.1016/j.applthermaleng.2019.04.051 ↗
5. Design of flat-plate dehumidifiers for humidification–dehumidification desalination systems10.1080/01457632.2013.730355 ↗
6. Design of plate-fin tube dehumidifiers for humidification–dehumidification desalination systems10.1080/01457632.2014.916153 ↗
7. Versuche über die kondensation von wasserdampf in film und tropfenform10.1007/BF02641051 ↗
8. Surface tension effects and enhancement of condensation heat transfer10.1205/026387604323050128 ↗
9. Dropwise condensation theory and experiment: A review10.1243/09576500260049034 ↗
10. A theory of heat transfer by dropwise condensation
11. A theoretical study of dropwise condensation10.1115/1.3450291 ↗
12. On the heat transfer in dropwise condensation10.1016/0300-9467(76)87016-5 ↗
13. Drop size distribution and heat flux of dropwise condensation10.1016/0300-9467(78)85052-7 ↗
14. Modeling of heat transfer in dropwise condensation10.1016/s0017-9310(97)00094-x ↗
15. Dropwise condensation modeling suitable for superhydrophobic surfaces10.1115/1.4003742 ↗
16. Theoretical investigation of stable dropwise condensation heat transfer on a horizontal tube10.1016/j.applthermaleng.2013.10.022 ↗
17. Dropwise condensation theory revisited part II. Droplet nucleation density and condensation heat flux10.1016/j.ijheatmasstransfer.2014.11.008 ↗
18. Time-averaged droplet size distribution in steady-state dropwise condensation10.1016/j.ijheatmasstransfer.2015.04.087 ↗
19. Heat transfer model of dropwise condensation and experimental validation for surface with coating and groove at low pressure10.1007/s00231-015-1641-0 ↗
20. Dropwise condensation heat transfer model considering the liquid-solid interfacial thermal resistance10.1016/j.ijheatmasstransfer.2017.04.061 ↗
21. Condensation heat transfer in a sessile droplet at varying Biot number and contact angle10.1016/j.ijheatmasstransfer.2017.07.077 ↗
22. Droplet departure modeling and a heat transfer correlation for dropwise flow condensation in hydrophobic mini-channels10.1016/j.ijheatmasstransfer.2018.04.140 ↗
23. Modeling and optimization of condensation heat transfer at biphilic interface10.1016/j.ijheatmasstransfer.2018.01.108 ↗
24. Mathematical model for dropwise condensation on a surface with wettability gradient10.1115/1.4039014 ↗
25. Dropwise condensation on superhydrophobic nanostructure surface, part II: Mathematical model10.1016/j.ijheatmasstransfer.2018.07.008 ↗
26. The condensation of steam10.1021/ie50234a018 ↗
27. A droplet model in steam condensation with noncondensable gas10.1016/j.ijthermalsci.2013.01.011 ↗
28. A new model for the processes of droplet condensation and evaporation on solid surface10.1016/j.ijheatmasstransfer.2016.04.099 ↗
29. Modeling of heat and mass transfer for dropwise condensation of moist air and the experimental validation10.1016/j.ijheatmasstransfer.2017.12.059 ↗
30. Die oberflachenkondensation des wasserdampfes
31. Experimental and empirical study of steam condensation heat transfer with a noncondensable gas in a small-diameter vertical tube10.1016/j.nucengdes.2007.07.001 ↗
32. An investigation of condensation from steam–gas mixtures flowing downward inside a vertical tube10.1016/s0029-5493(97)00185-4 ↗
33. Forced convection condensation in the presence of noncondensables and interfacial resistance10.1016/0017-9310(67)90053-1 ↗
34. Diffusion layer theory for turbulent vapor condensation with noncondensable gases10.1115/1.2911397 ↗
35. A diffusion layer model for steam condensation within the AP600 containment10.1016/s0029-5493(98)00164-2 ↗
36. Advances in condensation heat transfer10.1016/S0065-2717(08)70334-4 ↗
37. 2014
38. On the gravitational displacement of three-dimensional fluid droplets from inclined solid surfaces10.1017/s0022112099005844 ↗
39. 2006
40. A generalized diffusion layer model for condensation of vapor with noncondensable gases10.1115/1.2728907 ↗
41. Dehumidification heat transfer on copper surfaces10.1016/j.ijheatmasstransfer.2012.08.019 ↗
42. Film-wise and drop-wise condensation of steam on short inclined plates10.1007/s12206-007-1015-8 ↗
43. A kinetic model for heterogeneous condensation of vapor on an insoluble spherical particle10.1063/1.4861892 ↗
44. Delayed frost growth on jumping-drop superhydrophobic surfaces10.1021/nn3055048 ↗
45. A point sink superposition method for predicting droplet interaction effects during vapor-diffusion-driven dropwise condensation in humid air10.1016/j.ijheatmasstransfer.2017.11.045 ↗