Mist Cooling for Thermal Tempering of Glass

概要

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This paper presents a feasibility study of glass tempering using mist cooling. First, transient tests of mist cooling were conducted to investigate the effects of the thermal properties of a cooling surface. To do this, test plates made of silver, nickel, stainless steel (SUS 304), and fused quartz were used. The experimental conditions of mist flow were as follows : the air velocity was V_a=20 m/s, the temperature of the water droplets was T_l=21℃, and the volumetric droplet flow rate was D=0.000 3〜0.01 m^3/(m^2・s). The experimental data show that both the plate temperature corresponding to the minimum heat flux (T_M) and the heat transfer coefficients at wall temperature above T_M increase as the thermal conductance of the surface material decreases. Second, tempering tests of soda-lime glass plates of 2.95 and 3.90 mm thickness were conducted using mist cooling. The initial temperature of the glass plates was about 690℃. The plates were cooling. The initial temperature of the glass plates was about 690℃℃. The plates were cooled only from one side. The test results indicate that thin and low-cost tempered glass plates can be made by mist cooling without fracture.
一般社団法人日本機械学会の論文
1988-08-15