Transient Temperature Profile of a Hot Wall Due to an Impinging Liquid Droplet

Abstract

An experiment was made to investigate the heat transfer to a liquid drop impinging on a hot surface. The transient temperature of the heater surface was measured by a thin-film thermometer. The surface temperature fell to a contact temperature immediately after contact with the drop. The contact temperature increased with increasing initial surface temperature T0. In the case of the water drop, however, it was approximately constant for 200°C ≲ T0 ≲ 300°C; and it increased again for T0 ≳ 300°C. The surface temperature at the turning point, i.e., T0 ∼ 300°C, roughly coincided with the Leidenfrost point.

Dropwise cooling: Experimental tests by infrared thermography and numerical simulations

“…This solid surface temperature T s was chosen according to the theoretical contact temperature proposed by Seki et al [24] on the basis of the classical work by Carslaw and Jaeger [25], who developed it as the weighted average of liquid and solid effusivities by similarity with two semi-infinite solids in contact:…”

Hydrodynamics and boiling phenomena of water droplets impinging on hot solid

“…However, it would be difficult to correctly measure the local temperature experimentally without using such measurement devices. Instead, the temperature at the liquid/solid interface at the moment of impact can be estimated with a simple one-dimensional theory (Seki et al, 1978;Aziz and Chandra, 2000;Bernardin and Mudawar, 1999, 2002Cossali et al, 2008;Furuya and Arai, 2008). According to the one-dimensional transient heat conduction theory for interfacial contact between two semi-infinite solids with different temperatures (Carslaw and Jaeger, 1959;Eckert and Drake, 1972), the interfacial temperature, T i , is given by…”

“…The liquid is abruptly heated above the saturation temperature at the contact point, and the temperature of the solid surface decreases sharply (Seki et al, 1978). The high rate of increase in the liquid temperature leads to rapid boiling.…”

An impact regime map for water drops impacting on heated surfaces

“…Different studies focused in turn on the effect of the fluid properties [8], and of the surface wettability [11], morphology, and effusivity (defined as e ¼ ffiffiffiffiffiffiffiffiffiffi ffi qkc P p , where q is density, k is the thermal conductivity, and c P the specific heat) [12][13][14]. Transitions between impact regimes were studied mostly from an empirical point of view.…”