Journal of Space Science and Technology

Journal of Space Science and Technology

Hot Air Gun Identification by Inverse Heat Transfer

Document Type : Original Research Paper

Authors
Amir Mahdi Tahsini
Samaneh Tadayon Mousavi
Aerospace Research Institute; Ministry of Science, Research and Technology.Tehran.IRAN
Abstract
The aim of this paper is to identify the unknown properties of an industrial hot air gun using inverse heat transfer approach. A combination of experiments and numerical analyses is used to define the convection coefficient and the produced temperature of this device. A numerical solver is developed by employment of a straightforward and powerful inverse heat transfer method: “The conjugate gradient method for parameter estimation”. The variation of temperature versus time in a fixed point of a steel-304 rod is sensed by a thermocouple and is given as an input to the numerical solver. The produced temperature of the hot air gun and the variation of convection heat transfer coefficient of this device as a function of distance between gun and rod are estimated in this research. Two non-dimensional distances between hot air gun and head of rod, H/D, are considered in this research: 2 and 6. These distances are chosen based on the hot jet potential core, the former is inside the potential core and the latter is outside it. The identifications of this gun are used in the process of determining unknown thermal properties of insulating and ablative materials, which are essential components of ablative heat shields, by inverse heat transfer methods.
Keywords
Inverse Heat Transfer
Conjugate Gradient Method
Forced Convection
thermal properties
Numerical analysis

Article Title Persian

Hot Air Gun Identification by Inverse Heat Transfer

Authors Persian

امیر مهدی تحسینی
سمانه تدین موسوی
پژوهشگاه هوافضا، وزارت علوم، تحقیقات و فناوری، تهران، ایران
Abstract Persian

The aim of this paper is to identify the unknown properties of an industrial hot air gun using inverse heat transfer approach. A combination of experiments and numerical analyses is used to define the convection coefficient and the produced temperature of this device. A numerical solver is developed by employment of a straightforward and powerful inverse heat transfer method: “The conjugate gradient method for parameter estimation”. The variation of temperature versus time in a fixed point of a steel-304 rod is sensed by a thermocouple and is given as an input to the numerical solver. The produced temperature of the hot air gun and the variation of convection heat transfer coefficient of this device as a function of distance between gun and rod are estimated in this research. Two non-dimensional distances between hot air gun and head of rod, H/D, are considered in this research: 2 and 6. These distances are chosen based on the hot jet potential core, the former is inside the potential core and the latter is outside it. The identifications of this gun are used in the process of determining unknown thermal properties of insulating and ablative materials, which are essential components of ablative heat shields, by inverse heat transfer methods.

Keywords Persian

Inverse Heat Transfer
Conjugate Gradient Method
Forced Convection
thermal properties
Numerical analysis
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Journal of Space Science and Technology
Volume 8, Issue 4 - Serial Number 25
English Article
Winter 2016
Pages 29-34

  • Receive Date 06 October 2014
  • Revise Date 30 May 2016
  • Accept Date 13 January 2017
  • First Publish Date 13 January 2017