Contribution to the Study of the Influence of the Experimental Set-Up on the Vaporization Process of Vegetable Oil Droplets  

作　　者：Sampawinde Augustin Zongo Jacques Nébié Téré Dabilgou Soutongnoma Bouda Tizane Daho Sampawinde Augustin Zongo;Jacques Nébié;Téré Dabilgou;Soutongnoma Bouda;Tizane Daho(Laboratoire de Physique et de Chimie de l'Environnement (LPCE), Dpartement de Physique, Universit Joseph KI-ZERBO, Ouagadougou, Burkina Faso;Dpartement de Physique, Universit Thomas SANKARA, Ouagadougou, Burkina Faso;Centre Universitaire de Ziniar, Universit Joseph KI-ZERBO, Ziniar , Burkina Faso)

机构地区：[1]Laboratoire de Physique et de Chimie de l'Environnement (LPCE), Dpartement de Physique, Universit Joseph KI-ZERBO, Ouagadougou, Burkina Faso [2]Dpartement de Physique, Universit Thomas SANKARA, Ouagadougou, Burkina Faso [3]Centre Universitaire de Ziniar, Universit Joseph KI-ZERBO, Ziniar , Burkina Faso

出　　处：《Open Journal of Fluid Dynamics》2024年第4期224-241,共18页流体动力学(英文)

摘　　要：This study presents a contribution to the development of a model for vegetable oil droplets vaporization, with a particular focus on the influence of the experimental set-up for their use as fuel in diesel engines. Two systems were considered: an open-environment system obtained through a hot gas flow, and a closed-environment system. Vaporization was conducted under identical conditions, with the results subsequently compared. The findings indicate that, for temperatures between 473 K and 673 K, droplets behaviour in both systems presents only a heating and expansion phase. For temperatures above 673 K, the behaviour of the droplets differs between the devices. In the open environment device, a linear reduction in droplets diameter is observed following the transient phase, suggesting stationary vaporization and enabling the calculation of a vaporization constant and the well-known D2 law is respected. In the closed-environment device, puffing, micro-explosions and gas ejections are observed, and it is not possible to determine vaporization constant and D2 law is not respected. The results demonstrate the necessity of developing a model for the thermal decomposition of vegetable oil before attempting to create a model for the vaporization of these oils. In order to achieve this, it is essential to construct an experimental setup that more closely emulates the real conditions within the combustion chamber of a diesel engine, taking into account the variables of pressure, temperature and the heating process.This study presents a contribution to the development of a model for vegetable oil droplets vaporization, with a particular focus on the influence of the experimental set-up for their use as fuel in diesel engines. Two systems were considered: an open-environment system obtained through a hot gas flow, and a closed-environment system. Vaporization was conducted under identical conditions, with the results subsequently compared. The findings indicate that, for temperatures between 473 K and 673 K, droplets behaviour in both systems presents only a heating and expansion phase. For temperatures above 673 K, the behaviour of the droplets differs between the devices. In the open environment device, a linear reduction in droplets diameter is observed following the transient phase, suggesting stationary vaporization and enabling the calculation of a vaporization constant and the well-known D2 law is respected. In the closed-environment device, puffing, micro-explosions and gas ejections are observed, and it is not possible to determine vaporization constant and D2 law is not respected. The results demonstrate the necessity of developing a model for the thermal decomposition of vegetable oil before attempting to create a model for the vaporization of these oils. In order to achieve this, it is essential to construct an experimental setup that more closely emulates the real conditions within the combustion chamber of a diesel engine, taking into account the variables of pressure, temperature and the heating process.

关 键 词：Experimental Device VAPORIZATION Vegetable Oil Open Enclosure Closed Enclosure Diesel Engine 

分 类 号：TG1[金属学及工艺—金属学]