Estimation of Unknown Boundary Heat Flux in Laminar Circular Pipe Flow Using Functional Optimization Approach: Effects of Reynolds Number

作者：Ding Peng^*; Tao Wen Quan

来源：Journal of Heat Transfer-Transactions of the ASME, 2009, 131(2): 021701.

DOI：10.1115/1.3013825

• boundary layers
• conjugate gradient methods
• forced convection
• Fourier series
• inverse problems
• laminar flow
• optimisation
• pipe flow

An inverse forced convection problem was studied in this paper. The unknown space-dependent heat flux at the outer boundary of a circular pipe was identified from the temperature measurements within the flow using the algorithm based on an improved conjugate gradient method, which is a combination of the modified inverse algorithm proposed by Ozisik (Huang and Ozisik, 1992, "Inverse Problem of Determining Unknown Wall Heat Flux in Laminar Flow Through a Parallel Plate Duct," Numer. Heat Transfer, Part A 21, pp. 2615-2618) and the general inverse algorithm based on the conjugate gradient method. The effects of the convection intensity, the number of thermocouples, the location of the thermocouples, and the measurement error on the performance of the modified inverse algorithm method and the improved inverse algorithm were studied thoroughly through three examples. It is shown that the improved inverse algorithm can greatly improve the solution accuracy in the entire computation domain. The accuracy and stability of both the modified inverse algorithm method and the improved inverse algorithm are strongly influenced by the Reynolds number and the shape of the unknown heat flux. Those functions, which contain more high-frequency components of Fourier series, are more sensitive to the increase in the Reynolds number.

• 出版日期2009-2
• 单位西安交通大学