Mathematical Modeling of Heat and Mass Transfer in Heat Pipes in a One-Dimensional Formulation when Cooling Active Phased Antenna Arrays

Abstract

The work proposes test one-dimensional models of heat and mass transfer in heat pipes during cooling of active phased antenna arrays, which can be used in processing the test results of flat heat pipes in order to determine their performance characteristics and identify the parameters required for modeling in a more complex setting (for example, in flat and taking into account the presence of several localized sources of heat supply). To take into account the influence of the heat release power on the equilibrium temperature inside the heat pipe, the model has been added to take into account the dependence of the steam saturation temperature on the pressure, which is realized inside the steam pipeline when the heat pipe is heated. Numerous calculations carried out made it possible to refine the mathematical model. In particular, a significant effect on the temperature distribution along the heat pipe is shown, taking into account the dependence of the steam saturation temperature on the pressure in the parawire. It is shown that the introduction of standard functions for the characteristics of the coolant (water) in the liquid and vapor state, as well as taking into account the capillary pressure on temperature, makes it possible to refine the resulting solution.

Effect of protecting coatings on mechanical properties of metal surfaces

“…However, if we recalculate the modulus of elasticity of the plates from the results of these tests, it will always be lower for the coated specimens than for the uncoated ones, due to their increased thickness determined by taking into account the presence of coatings (see Table 1). Provided the plate deflections and loads are measured with high accuracy, this type of test can be used to identify the elastic modulus of coatings [6][7][8][9][10][11][12]. In particular, a Young's modulus value of about 3 GPa was found for the investigated coatings.…”

“…Polymer protective coatings are widely used in various fields of technology to protect structural elements against corrosion, provide electrical insulation, control the friction characteristics of surfaces, and for decorative purposes, etc. [1][2][3][4][5][6][7][8][9][10][11][12]. The study of the mechanical properties of coatings is an important task in terms of ensuring their strength and wear resistance during operation [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27].…”

Application of the spherical indenter for determination of the elastic modulus of coatings

“…In recent years, the continuous indentation method, formerly known as the kinetic rigidity method, has been increasingly used to determine the rigidity of materials [1][2][3][4][5][6]. The essence of the kinetic rigidity method is that an indenter is introduced into the material under study and two parameters are recorded: the load and the depth of introduction of the indenter.…”

Heat transfer from a constant heat source to the plate surface: An analytical solution

“…And in papers [34][35][36][37][38] various mechanical investigations of heat protective composite materials on the basis of both analytical and numerical methods are given. Analytical solutions of thermoelasticity problems are important, including the validation of numerical solutions [39][40][41][42][43][44][45][46][47][48]. In this paper, we propose an analytical solution to the thermoelasticity problem for a plate heated by a source with a constant heat input at one surface.…”