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What is the purpose of winding the metal wire into a spiral when doing the experiment of burning it in oxygen?
The purpose of winding the iron wire into a spiral shape is to increase its contact area with oxygen and increase the local temperature of the iron wire as soon as possible.

Combustion is an exothermic and luminous chemical reaction, and its reaction process is extremely complicated. The chain reaction of free radicals is the essence of combustion reaction, and light and heat are physical phenomena in the combustion process.

The rapid exothermic and luminescent oxidation reaction of combustible materials with oxygen or air takes place in the form of flame. The combustion of coal, oil and natural gas is the main source of heat energy in all sectors of the national economy. Recently, the surge of energy demand and the rapid development of aerospace technology have promoted the combination of fluid mechanics, chemical reaction kinetics and heat and mass transfer, and made the combustion discipline develop by leaps and bounds. On the other hand, the development of fire prevention technology aimed at eliminating combustion has also promoted the study of combustion theory.

In the combustion process, momentum, heat and mass are transferred among fuel, oxygen and combustion products, forming a complex flame structure with multi-component concentration gradient and non-isothermal two-phase flow. These transfers in the flame are realized by laminar molecular transfer or turbulent micelle transfer, while the industrial combustion device is mainly turbulent micelle transfer. It is an important content to study the combustion process from the perspective of fluid mechanics and explore the distribution law of velocity, concentration and temperature in the combustion chamber and their interaction. Because of the complexity of combustion process, experimental technology is the main means to discuss combustion engineering. Computational combustion developed in recent years has made remarkable progress in the research and development of engineering problems such as flow field in combustion equipment, fuel ignition and combustion heat transfer process, flame stability and so on by establishing a physical model of combustion process and numerically solving differential equations such as momentum, energy and chemical reaction.