The Effect Of Impingement Hot Air On Temperature Distribution Of The Flat Plate
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Date
2021-07-01
Authors
Kasim, Nor Asikin
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
Until recently, ice on an aircraft’s surface was seen as a severe aerodynamic and flight mechanical problem that may jeopardise aircraft flight safety. Hot air jet impingement is one method used to eliminate icing on critical aircraft surfaces such as the nacelle lip skin. However, due to the direct impact of the hot air jet on the nacelle lip skin, a hotspot was created. Thus, this project is concerned with a numerical study of the convective heat exchange between an impinging air jet at temperatures of 50° C, 55° C, and 60° C and a structured flat surface using the Fluent tool to reduce the hot spot on the surface. Standard k-ɛ model using the energy equation are carried out on a model jet in a three-dimensional domain with periodic boundary conditions. The range of jet Reynolds numbers utilised in the simulations is 2000–5000, while the jet-to-target distance remains constant at 37.05 mm using a circular 2.5 mm nozzle. The target plate is flat steel, copper, and aluminium plate with a 1 mm, 2 mm, and 3 mm thickness. The effect of Reynolds number impingement flow on temperature distributions on a flat plate can be seen that at 50°C for a 1 mm steel plate, the Reynolds number is raised to 4085.86, the 𝑇̌ is increased to 0.0734, and the 𝑇̌ is decreased to 0.0483 when Reynolds number (Re) of 2200.08. The relationship between Reynolds number and Nusselt number to the hot air impingement study was found that heat transfer rises with velocity and Reynolds number and subsequently with Nusselt number on the impinging point. The maximum Nusselt number increases from 4.3213 to 5.2620 when the Reynolds number grows from 2200.08 to 4085.86 for 1 mm thick steel. Material type and thickness on dimensionless temperature were examined. The thickness and material analyses on the flat plate showed that the lower the thermal conductivity of the material and the thicker the plate, the longer it takes for heat to flow through the wall. Copper with a thickness of 3 mm at 55° C air-jet temperature exhibits a fast change in thermal performance on a 0.0391 surface plate. In contrast, steel with identical conditions shows a sluggish change in thermal performance on a 0.290 surface plate at a Reynolds number of 4085.86. In conclusion, steel at a thickness of 3 mm with hot air temperatures ranging from 50° C to 60° C also all Reynolds number is the best model for minimising hot spots or surface overheating.